Wonboyn Lake is a fully-tidal estuarine lake at the southern extreme of the Sapphire Coast of New South Wales. It lies between the Ben Boyd National Park/Boyd State Forests and the Nadgee Nature Reserve/State Forest.
The lake is fed by the Wonboyn River, and empties into Disaster Bay through the entrance at Baycliff, almost midway between Greencape Lighthouse and Greenglades Beach.  There are some ten kilometres of navigable water in the river and lake system.
Wonboyn Lake, its estuary and beaches were declared a recreational fishing haven by the NSW government some years ago, putting the area off limits to commercial fishing. This will help to ensure that fish stocks in our system remain sustainable at worst, and hopefully mean that they continue to improve, as evidence to date suggests they have.
Wonboyn Village and the park itself are just 500 meters or so uphill from the boat ramp and jetties at Myrtle Cove. There is 2WD vehicle access, via National Park bush tracks, to five kilometres of stunning and unspoilt beaches.
Have a look at the aerial view of the district, and also check out Google Earth's more recent satellite view of the area. This includes some excellent photos posted by visitors.