Wallaga Lake is the largest estuary in the Bega Valley Shire, and is situated between Tilba Tilba and Bermagui. It has a surface area of 7.8 km2 and a catchment of 280 km2. The two main creeks feeding the lake are Dignams and Narira Creeks. Wallaga Lake and the majority of its catchment falls within the Bega Valley Shire Council Local Government Area (LGA), with the northern section of the catchment falling within the Eurobodalla Shire Council LGA. The LGA boundary is along the northern shore of Wallaga Lake and Dignams Creek. Gulaga National Park forms a large section of the lake foreshore and catchment, while the remainder of the catchment is mostly comprised of by Bermagui State Forest and private properties. Wallaga Lake is classified as an Intermittently Closed and Open Lake or Lagoon (ICOLL), meaning that its entrance to the ocean is sometimes open to tidal exchange, but at other times is closed off by a sand barrier at the beach. The lake entrance is typically open to the ocean about 60% of the time, with the entrance actively managed by BVSC under its Entrance Management Policy to reduce the impacts of foreshore flooding when the entrance is closed.