Largest cities
Ashgabat 1,030,000 pop., 1,241,000 urban aggl.
Highest mountains
Aırybaba 3,139 m (10,299 ft)
Mount Rizeh 2,912 m (9,554 ft)
Longest rivers
Amu Darya 2,540 km (1,578 mi) total, including parts in Afghanistan, Tajikistan and Uzbekistan
Largest lakes
Caspian Sea 371,000 km² (143,244 sq mi) total, shared with Russia, Kazakhstan, Azerbaijan and Iran
Sarygamysh 5,000 km² (1,931 sq mi) total average area including section in Uzbekistan, about 3/4 of the lake belongs to Turkmenistan
Largest islands
Ogurja Ada (in the Caspian Sea) 60 km² (26 sq mi)