The Mamonovka or Banovka (Russian: Мамоновка, Polish: Banówka, German: Bahnau) is a river between Russia (Kaliningrad Oblast) and Poland (Warmian-Masurian Voivodship).

It flows into the Vistula Lagoon.

It is 51 km long and has a 311 km2 drainage basin.

This article related to a river in Russia is a stub.

You can help Wikipedia by expanding it.This article related to a river in Poland is a stub.