Sawa lake (Arabic: بحيرة ساوة‎‎) is an Endorheic basin located in the Iraqi governorate of Muthanna near to the Euphrates River, some 23 kilometres (14 mi) to the west of Al-Samawa city. This lake has no inlet or outlet but,its feeds water from Euphrates through a system of joint cracks and fissures which transport water to aquifers beneath it. water's level fluctuates during dry and wet seasons. Water does not dry up because of the equilibrium state between water feed and evaporation.