The Mewstone is listed by the Marine Life Network among the Eden dive sites as an extension of the same reef as Warang Point, with its eastern side offering colourful sponge gardens and better fish life.

'Mewstone' is a common name for isolated rocks around Australia and Britain, usually because gulls ('mews') roost on them. The Eden Mewstone appears to be a rock rising from a reef that continues from Warang Point, which the Marine Life Network describes as a large flat reef marked by boulders and crevices, 10–25 m, with sponges near the deeper overhangs. The eastern side of the Mewstone, facing the open sea, gets more water movement, which explains the richer sponge growth and fish. Expect sponges, sea squirts and gorgonians, schools of yellowtail and sweep, blue groper, red morwong, leatherjackets and bullseyes, with wobbegongs and Port Jackson sharks in the crevices and seals passing through.

The site suits Open Water divers with a guide, or more experienced divers on private boats. It is best dived with local knowledge, and the operators in Eden and Merimbula can confirm its location and current condition. Twofold Bay has no marine park, but Beowa National Park protects much of the surrounding shoreline. Divers who visit are encouraged to record its position and depths.

Boat access only. Local boats launch at the four-lane Quarantine Bay ramp 3 km south of Eden (toilets, cleaning tables, trailer parking) or from Snug Cove in the town harbour and run south across Twofold Bay. The Marine Life Network describes the Mewstone as an extension of the same reef as Warang Point.

Ask local operators for the position.

Rocks and reefs at the edges of Twofold Bay are exposed to easterly swell entering the bay; the bay gives shelter from southerly swell on its southern shore. Dive in calm conditions with swell under about 1.5 m. Visibility in the bay is often good but falls after heavy rain and big seas.

Anchor near the rock and dive the eastern side, where the sponge gardens and fish are best, following the reef down to the sand edge and returning shallower. Set a turn pressure, stay with the reef for navigation and ascend on the anchor line.

Listed by the Marine Life Network; no current operator publishes it. Merimbula Divers Lodge or Dive Eden may run it on request.