The Aragvi River (Georgian:არაგვი) and its basin are in Georgia on the southern slopes of the Caucasus Mountains. The river is 112 kilometres (70 mi) long, and its basin covers an area of 2,724 square kilometres (1,052 sq mi). The ground strata is mostly sandstone, slate, and limestone. The Zhinvali Dam and its 130 MW hydro-electric power station generate much of Georgia’s power, and its construction in 1986 formed the Jinvali Reservoir, upon whose north-western shores rises Ananuri castle with its 17th-century Church of the Assumption.