Mummuga Lake sits between the village of Dalmeny and Eurobodalla National Park on the New South Wales South Coast, approximately 350 kilometres south of Sydney and 210 kilometres south-east of Canberra. The lake is an easy five-minute drive from Narooma and is accessible via Mort Avenue off the Princes Highway between Bodalla and Narooma.

The lake has a boat ramp providing water access, with GPS coordinates placing it at approximately -36.157, 150.116. There is also a walking trail from the Bodalla Park Rest Area and Campground that leads to the lake's edge, with the track running close to the water in several sections, giving the impression of a river before the lake opens up more broadly. A rocky area reached after roughly 1,300 metres along this trail offers a suitable entry point for swimming and potentially for paddlers looking to access the water on foot.

The lake supports kayaking and fishing, and is noted for flathead (both bartail and dusky) and yellowfin bream. Fish are frequently observed jumping near the water's edge along the walking trail. The lake's character shifts between narrow, river-like passages and broader open water, offering varied paddling terrain.

At the Dalmeny Beach inlet end of the lake, the water depth ranges from one to two metres, with concrete steps and sand underfoot. Hazards at this end include sharp rocks along the bank near deeper water and the presence of stingrays. Water clarity is described as clear and temperatures as mild. No dogs, camping, fires, horses, or vehicles on the beach are permitted in this area, managed by Eurobodalla Shire Council. Public toilets, an outdoor shower, and car parking are available near the inlet entry point at Mort Avenue, opposite Tatiara Street in Dalmeny.

The lake is visually striking, particularly for its reflective qualities, and is bordered by national park bushland. The surrounding area includes shops within a short walk of the Dalmeny inlet access point.