Largest cities
Athens 643,000 pop., 3,309,000 urban aggl.
Thessaloniki 319,000 pop., 844,000 urban aggl.
Highest mountains
Mount Olympus 2,904 m (9,528 ft)
Longest rivers
Evros 514 km (319 mi) total, 204 km (127 mi) in Greece
Aliákmonas 297 km (185 mi)
Largest lakes
Great Prespa Lake 274 km² (106 sq mi) total, 48 km² (18.5 sq mi) in Greece
Lake Trichonida 96 km² (37 sq mi)
Lake Volvi 70 km² (27 sq mi)
Largest islands
Crete 8,265 km² (3,191 sq mi)
Euboea 3,652 km² (1,410 sq mi)
Lesbos 1,631 km² (630 sq mi)