City Europe
Thessaloniki
Thessaloniki is a big city in Greece, by the sea. A round stone tower, the White Tower, stands on its seafront.
Thessaloniki is the heart of Greece's second-biggest urban area, on the Thermaic Gulf, a bay of the Aegean Sea. Founded in 315 BC, it became a port and provincial capital, and its old churches and city walls are a UNESCO World Heritage site. The municipality had 319,044 people at the 2021 census.
Thessaloniki (municipality 319,044, Greater Thessaloniki 747,867; census 2021) was founded in 315 BC, became a provincial capital and sea port, and was an important artistic center throughout the Byzantine period; its Paleochristian and Byzantine monuments, including 4 km of city walls, joined the World Heritage List in 1988. Its seafront is marked by the White Tower, dated by Wikidata to the 16th century.
Photo: Ωριγένης, CC BY-SA 3.0, via Wikimedia Commons
Discover Thessaloniki
Thessaloniki is a big city in Greece. It lies along the sea.
It is very old. People have lived there for more than 2,000 years!
Thessaloniki is a city in northern Greece, on the Thermaic Gulf, a bay of the Aegean Sea. At the 2021 census, 319,044 people lived in the municipality of Thessaloniki and 747,867 in Greater Thessaloniki, the group of municipalities around it. Its wider built-up area is the second largest in Greece, after Athens.
UNESCO says the city was founded in 315 BC and became a provincial capital and sea port.
Hellenic Statistical Authority (via City Population), census of 22 October 2021: Municipality of Thessaloniki 319,044 (2011: 325,182); Greater Thessaloniki, the sum of its municipalities, 747,867 (2011: 754,566). City Population's Greek city table ranks the Thessaloniki agglomeration second (802,392 in 2021, on its wider definition), after Athens.
UNESCO (World Heritage property 456): 'Founded in 315 BC, the provincial capital and sea port of Thessalonika was one of the first bases for the spread of Christianity.' Wikidata places the city on the Thermaic Gulf, a bay of the Aegean Sea.
- Country
- Greece
- People in the municipality (census, 22 October 2021)
- 319,044
- People in Greater Thessaloniki (same census)
- 747,867
- Founded
- 315 BC
The White Tower and the seafront
Look at the round stone tower by the water! Behind it are trees, and a long row of tall white buildings.
The sea in front is deep blue, and a big hill rises behind the city.
This photo, taken on 7 June 2007, looks across the water at Thessaloniki's seafront from the port. A long row of apartment buildings with balconies faces the deep blue gulf, and on the right the round, stone White Tower rises above green trees. Behind the city, houses climb a slope, and a large dark hill fills the left of the sky.
Wikidata describes the White Tower as a fortified tower from the 16th century, about 34 meters tall. The street along the seafront is Leoforos Nikis.
Commons: 'Thessaloniki View of waterfront', 7 June 2007, own work by the uploader Ωριγένης, GFDL / CC BY-SA 3.0; categories 'Apartment buildings in Thessaloniki', 'Leoforos Nikis (Thessaloniki)' and 'White Tower (Thessaloniki)'; camera location about 1.27 km WNW of Wikidata's point for the tower. The image is 1,198 by 891 pixels.
Wikidata: White Tower of Thessaloniki, a fortified tower and museum, inception 16th century, height 33.9 m.
- Photo
- the seafront and the White Tower, 7 June 2007
- White Tower
- a fortified tower from the 16th century, about 34 m tall (Wikidata)
- Seafront avenue
- Leoforos Nikis (Commons category)
A port city for more than 2,000 years
Thessaloniki was founded long, long ago. Ships have sailed in and out of its port ever since.
It still has old city walls and beautiful old buildings.
UNESCO says Thessaloniki was founded in 315 BC and became a provincial capital and sea port. Over many centuries, from the 4th to the 15th, people built churches there with famous mosaics, and the city was an important center of art, trading ideas with Rome and Constantinople.
Its old monuments, including about 4 kilometers of city walls, were added to UNESCO's World Heritage List in 1988.
UNESCO (property 456, inscribed 1988, criteria i, ii, iv): founded in 315 BC, the provincial capital and sea port was one of the first bases for the spread of Christianity; its churches, built from the 4th to the 15th century on central, basilica and transitional plans, form a typological series that influenced the Byzantine and later the Serbian world. The listed monuments are public buildings with religious, secular and military functions, including the 4 km city walls. Throughout the Byzantine era the city was a cultural center in continuous artistic exchange with Rome and Constantinople; the mosaics of the Rotunda, Saint Demetrius and Hosios David are among the great masterpieces of Early Christian art.
- Founded
- 315 BC
- City walls
- about 4 km long
- World Heritage List
- 1988 (Paleochristian and Byzantine Monuments)
A port, an airport and a new metro
Ships come to Thessaloniki's port. Since 2024 the city has had a metro, with trains that run under the ground.
The Port of Thessaloniki lies about 2.5 kilometers west-northwest of the White Tower, Wikidata says. The city's metro opened on 30 November 2024.
Thessaloniki Airport "Makedonia" is about 12 kilometers south of the tower, by the gulf. Aristotelous Square, a large square in the center, opens onto the seafront about 0.9 kilometers northwest of the White Tower.
Wikidata (from the White Tower, Q550576): Aristotelous Square 0.90 km NW; Port of Thessaloniki 2.47 km WNW; the Walls of Thessaloniki (point) 1.86 km NNE; Thessaloniki Airport "Makedonia" 12.01 km S. Thessaloniki Metro: opened 2024-11-30.
UNESCO describes Thessaloniki since its founding as a provincial capital and sea port.
- Port of Thessaloniki
- about 2.5 km west-northwest of the White Tower (Wikidata)
- Thessaloniki Metro
- opened 30 November 2024 (Wikidata)
- Thessaloniki Airport "Makedonia"
- about 12 km south of the White Tower (Wikidata)
Hot, dry summers and cool, wetter winters
Thessaloniki is hot in summer and cold in winter. More rain falls in winter than in summer.
The World Meteorological Organization's table for Thessaloniki gives July an average high of about 32 °C, the hottest of the year. January highs average about 9 °C, and January lows about 1 °C.
Adding up the monthly averages gives about 449 millimeters of rain a year. December and November are the wettest months, with about 55 millimeters each, and August the driest, with about 20.
WMO World Weather Information Service, Thessaloniki (Greece; station at 40.52° N, 22.97° E; the table gives data years 1959–1997 and no rain-day definition): average highs from 9.3 °C in January to 31.5 °C in July (August 31.1 °C); average lows from 1.3 °C in January to 18.6 °C in July. Rainfall sums to 448.7 mm; December (54.9 mm) and November (54.4 mm) are the wettest months, August (20.4 mm) the driest. Rain-day counts are not used here because the table does not define a rain day.
- July, average high (WMO table, Thessaloniki)
- 31.5 °C
- January, average low (same table)
- 1.3 °C
- Rainfall in a year (sum of the monthly averages)
- about 449 mm
Mosaics, a museum tower and a big square
Thessaloniki has very old buildings. Inside are mosaics, pictures made of many tiny pieces.
UNESCO calls the mosaics in three of Thessaloniki's oldest buildings, the round Rotunda, Saint Demetrius and Hosios David, some of the great masterpieces of early Christian art. Over many centuries painters also covered the walls of the city's churches with frescoes.
Today the White Tower is a museum as well as a landmark, Wikidata says. Aristotelous Square, named after the ancient Greek thinker Aristotle, is a large square in the city center.
UNESCO: wall paintings, mosaics and frescoes in Thessaloniki's monuments trace Byzantine monumental painting from its beginnings (the Rotunda, Saint Demetrius, Hosios David) through the Comnenian period to the late Byzantine 'Palaeologan Renaissance'; the city was an important artistic center from its foundation and throughout the Byzantine period.
Wikidata: White Tower of Thessaloniki, instance of fortified tower and museum; Aristotelous Square, a square in Thessaloniki named after Aristotle.
- Mosaics
- the Rotunda, Saint Demetrius and Hosios David: 'great masterpieces of Early Christian art'
- Aristotelous Square
- named after Aristotle (Wikidata)
- White Tower
- a fortified tower and a museum (Wikidata)
Thessaloniki on the map
Find Greece on the globe. Thessaloniki is in the north of Greece, by the sea.
Thessaloniki lies at about 40.6° north, in northern Greece, at the top of the Thermaic Gulf. Measured from the White Tower, Aristotelous Square is about 0.9 kilometers northwest and the port about 2.5 kilometers west-northwest.
The airport is about 12 kilometers south, beside the gulf.
Thessaloniki lies at about 40.64° N and 22.94° E (Wikidata point). From the White Tower (Wikidata points): Aristotelous Square 0.90 km NW, the photo's camera 1.27 km WNW, the Walls of Thessaloniki 1.86 km NNE, Port of Thessaloniki 2.47 km WNW, Thessaloniki Airport "Makedonia" 12.01 km S.
Wikidata: the Thermaic Gulf is a bay of the Aegean Sea in Macedonia, Greece.
- Latitude
- about 40.6° north
- Longitude
- about 22.9° east
- Setting
- on the Thermaic Gulf, a bay of the Aegean Sea
Amazing facts
-
Thessaloniki is more than 2,300 years old!
UNESCO says Thessaloniki was founded in 315 BC, more than 2,300 years ago.
UNESCO (property 456): 'Founded in 315 BC, the provincial capital and sea port of Thessalonika...'
-
Thessaloniki's old city walls are about 4 kilometers long!
The old city walls of Thessaloniki, part of its World Heritage monuments, are about 4 kilometers long, UNESCO says.
UNESCO: the listed monuments are public buildings with religious, secular and military functions, 'including the 4 km long city walls'.
-
A big square in Thessaloniki is named after a famous thinker from long ago.
Aristotelous Square, in the center of Thessaloniki, is named after the ancient Greek thinker Aristotle, Wikidata says.
Wikidata: Aristotelous Square (Q667472), a square in Thessaloniki, named after Aristotle; about 0.9 km NW of the White Tower.
-
Thessaloniki got trains that run under the ground in 2024!
Thessaloniki's metro opened on 30 November 2024, Wikidata says.
Wikidata: Thessaloniki Metro (Q1326567), opened 2024-11-30.
Words to know
- gulf
- a large bay, where the sea reaches into the land
- mosaic
- a picture made of many tiny pieces of colored stone or glass
- fresco
- a painting made on wet plaster on a wall
- city walls
- strong walls built around a city long ago to protect it
- municipality
- a town or city area with its own local government
- metro
- a city railway, often running under the ground
Discovery challenge
-
Thessaloniki is a city in which country?
Thessaloniki, on the Thermaic Gulf, is in which country?
Thessaloniki's World Heritage monuments, inscribed in 1988, are in which country?
- Greece
- Mexico
- Japan
Show the answer
Greece
Greece!
Greece.
Greece.
-
What stands by the sea in the photo of Thessaloniki?
Which round stone landmark stands on Thessaloniki's seafront?
Which 16th-century fortified tower, now a museum, stands on Thessaloniki's seafront?
- The White Tower
- A lighthouse made of glass
- A giant wheel
Show the answer
The White Tower
The White Tower!
The White Tower.
The White Tower of Thessaloniki.
-
When was Thessaloniki founded?
UNESCO says Thessaloniki was founded in which year?
According to UNESCO, the provincial capital and sea port was founded in which year?
- 315 BC
- 1315
- 1915
Show the answer
315 BC
315 BC, very long ago!
315 BC.
315 BC.
-
What is a mosaic?
UNESCO praises the mosaics in Thessaloniki's oldest buildings. What is a mosaic?
The Rotunda's mosaics are among the masterpieces UNESCO names. What is a mosaic?
- A picture made of tiny pieces of stone or glass
- A kind of boat
- A song
Show the answer
A picture made of tiny pieces of stone or glass
A picture made of tiny pieces!
A picture made of tiny pieces of stone or glass.
A picture made of tiny pieces of stone or glass.
-
When did Thessaloniki's metro open?
In which year did Thessaloniki's metro open?
Wikidata gives which year for the opening of the Thessaloniki Metro (30 November)?
- 2024
- 1924
- 1824
Show the answer
2024
2024!
2024.
2024.
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For parents & teachers
What children will learn
- Locate Thessaloniki on the Thermaic Gulf in northern Greece.
- Explain why a sea port can stay important for more than 2,000 years.
- Describe what mosaics and frescoes are and why they are protected.
- Read a climate table and compare a wet winter with a dry summer.
Recommended ages: 3 to 17 · About 15 minutes
Talk about it
- Thessaloniki has been a port for more than 2,000 years. What makes a good place for a port?
- Why do you think cities long ago built walls around themselves?
- Thessaloniki's summers are dry and its winters wetter. How is that different from where you live?
Try at home or in class
- Paper mosaic: make a picture from small squares of colored paper.
- Tower model: build a round tower from a cardboard tube and add paper battlements.
- Rain chart: plot Thessaloniki's monthly rainfall and find the driest month.
Key vocabulary: gulf, mosaic, fresco, city walls, municipality, metro
Where these facts come from
- Wikidata , Wikimedia Foundation (CC0 1.0)
- Natural Earth vector data , Natural Earth (NACIS) (Public domain)
- Greater Thessaloniki: Municipalities , City Population (Thomas Brinkhoff), from the Hellenic Statistical Authority
- Greece: Regions, Major Cities & Agglomerations , City Population (Thomas Brinkhoff), from the Hellenic Statistical Authority
- Paleochristian and Byzantine Monuments of Thessalonika (World Heritage List) , UNESCO World Heritage Centre
- Thessaloniki: climatological information , World Meteorological Organization, World Weather Information Service (Greece)
- File:Thessaloniki View.jpg (Ωριγένης, 7 June 2007) , Wikimedia Commons
- Wikimedia Commons , Wikimedia Foundation (Per file (public domain, CC0, CC BY or CC BY-SA); see each media record)
Checked, not yet human-reviewed. Last updated November 1, 2026. Spotted a mistake? Tell us.