Tajikistan is landlocked, and is the smallest nation in Central Asia by area. It lies mostly between latitudes 36° and 41° N, and longitudes 67° and 75° E. It is covered by mountains of the Pamir range, and most of the country is over 3,000 metres (9,800 ft) above sea level. The only major areas of lower land are in the north (part of the Fergana Valley), and in the southern Kofarnihon and Vakhsh river valleys, which form the Amu Darya. Dushanbe is located on the southern slopes above the Kofarnihon valley.
The Amu Darya and Panj rivers mark the border with Afghanistan, and the glaciers in Tajikistan’s mountains are the major source of runoff for the Aral Sea. There are over 900 rivers in Tajikistan longer than 10 kilometres.