The Sestra (Russian: Сестра́) is a river in Moscow Oblast, Russia. It is a left tributary of the Dubna (Volgabasin). Its source is the Senezh Lake. The length of the river is 138 km (86 mi). The area of its basin is 2,680 km2 (1,030 sq mi).[1] The river freezes over in November to early January and stays icebound until late March or April. Its main tributary is the Yakhroma. The town of Klin is located on the Sestra.