Dnestr radar () and Dnepr radar (), both known by the NATO reporting name Hen House are the first generation of Soviet space surveillance and early warning radars. Six of the phased array radars were built around the periphery of the Soviet Union starting in the 1960s to provide ballistic missile warnings for attacks from different directions. They were the primary Soviet early warning radars for much of the later Cold War. In common with other Soviet and Russian early warning radars they are named after rivers, the Dnestr and the Dnepr.