The Abelitz (-litz = Leide = channel) is a river of Lower Saxony, Germany, in East Frisia. It is about 20 kilometres (12 mi) long and flows from Marienhafe to its mouth on the Alte Greetsieler Sieltief. This type of river that drains the low-lying polders through a sluice in the sea dyke is also known locally as a Tief and is often the course of an old creek between mudflats. The bird life on and near the Abelitz is very diverse. During the breeding season riverside walkers and anglers are expected to conduct themselves considerately.