Over 80% of the country is covered by the Karakum Desert. The center of the country is dominated by the Turan Depression and the Karakum Desert. Topographically, Turkmenistan is bounded by the Ustyurt Plateau to the north, the Kopet Dag Range to the south, the Paropamyz Plateau, the Koytendag Range to the east, the Amu Darya Valley, and the Caspian Sea to the west. Turkmenistan includes three tectonic regions, the Epigersin platform region, the Alpine shrinkage region, and the Epiplatform orogenesis region.   The Alpine tectonic region is the epicenter of earthquakes in Turkmenistan. Strong earthquakes occurred in the Kopet Dag Range in 1869, 1893, 1895, 1929, 1948, and 1994. The city of Ashgabat and surrounding villages were largely destroyed by the 1948 earthquake.