The Netta [ˈnɛtta] is a river in north-east Poland, a right tributary of the Biebrza, approximately 20 kilometres (12 mi) long. It is a continuation of the Rospuda, which flows into Lake Rospuda (connected to Lake Necko) north of the town of Augustów. The Rospuda and Netta together have a length of 102 kilometres (63 mi) and a watershed of 1,336 square kilometres (516 sq mi).