Wallis Lake is a wave-dominated coastal barrier estuary extending approximately 18 kilometers from its ocean entrance at Forster-Tuncurry south to Charlotte Bay. This vast estuarine system is renowned for its extensive and rich seagrass beds, sand flats, and numerous oyster leases, which create a highly productive marine habitat. The lake's southern basin is noted for its diverse sponge communities. As a popular and well-known fishing destination, it can experience significant activity during holiday periods.