The Avoca Lake is fed by stormwater runoff into Saltwater Creek that gathers on the slopes within Kincumber Mountain Reserve to the northwest above Pickets Valley.

[2] Its outflow is into Bulbararing Bay in the Tasman Sea of the South Pacific Ocean.

The outflow is generally closed, and water levels inside the lake are not usually influenced by ocean tides.

Bareena Island lies entirely within Avoca Lake.

This Central Coast geography article is a stub.