Wonboyn is a small village on Wonboyn Lake, at the southern edge of Beowa National Park and next to Nadgee Nature Reserve, about 40 minutes' drive south of Eden. For divers its importance is as a launching point: McFadyen recommends it for small boats heading to the Green Cape wrecks (Ly-ee-Moon, City of Sydney and New Guinea), because it is much closer than Eden. But the lake, river and bar are very shallow, and boats can only get to sea within about two hours either side of high tide. He suggests a high tide of about 1.8 m between 9 am and noon, so the bar can be crossed at 7–10 am, and no southerly swell.

The entrance has sand, weed and seagrass, with tidal flow bringing in clear water on the flood. Expect bream, luderick, whiting, flathead, mullet and leatherjackets, with stingrays on the sand and possibly pipefish and seahorses in the weed. Wonboyn Beach faces Disaster Bay and gets surf.

Wonboyn suits divers planning Green Cape trips and snorkellers who want an easy tidal swim. The bar is hazardous, and anyone launching a boat should get local advice and watch the conditions carefully. The village has a general store, cabins and camping nearby. Booking ahead is wise in holiday periods, and fuel should be topped up in Eden. The lake itself is popular for fishing and kayaking.

From Eden drive about 20 km south on the Princes Highway and turn left onto Wonboyn Road, which leads to Wonboyn village and the lake (about 40 minutes from Eden). There is a boat ramp, general store and cabins. Divers use Wonboyn as the small-boat launch for the Green Cape wrecks, but the lake, river and bar are very shallow and only navigable to the sea about two hours either side of a high tide of 1.8 m or more (McFadyen).

For snorkelling, the lake entrance is reached by walking from the beach.

The lake entrance is tidal and the bar shallow; McFadyen's rule for boats is a high tide of about 1.8 m occurring 9 am–12 pm, allowing a bar crossing at 7–10 am, with no swell from the south. For snorkelling, use the flood tide near high water after dry weather; the ebb carries turbid water out and can be strong. Swell breaking on the bar is dangerous.

For snorkelling, enter on the flood an hour before high tide and drift gently into the lake along the channel edges, exiting before the tide turns. For boat divers, plan the day around the bar tide window and head to the Green Cape wrecks.

No operator; McFadyen recommends Wonboyn as the small-boat launch for the Green Cape wrecks.