Meet the site
Ranelagh Beach is the private-feeling cove below the Ranelagh estate at Mount Eliza, distinguished by its row of colourful beach shacks and reached by a track from the end of Earimil Drive. The Scuba Doctor lists it as a 0–6 m shore dive with points of interest at both ends of the beach and access to Cahills Reef, which is marked by a beacon offshore. It is a close cousin of the two Daveys Bay sites 1.9 km to the north-east: shallow, sheltered on the right wind, and built around low sandstone reef with small ledges and boulder piles at the points and a beacon-marked reef out from the beach. The reef and points hold the small-fish community of the eastern bay – southern hulafish, bullseyes, magpie perch, old wives, leatherjackets and moonlighters – and the rocks hide decorator crabs, hermit crabs, small octopus and abalone, while the sand between reef and beach carries seagrass patches where fiddler rays, stingarees and flathead settle. Cuttlefish visit in winter and squid at dusk. Cahills Reef is the deepest and most rewarding part of the site but it is an open-water swim through a stretch of coast busy with jet skis and boats in summer, which is why the source's only explicit warning is about traffic and a flag. Ranelagh has no facilities and limited residential parking, and it is too shallow to interest experienced divers looking for depth; what it offers is a quiet, scenic beginner and snorkel site on the Mount Eliza cliff coast with a definite objective in the beacon reef. It suits new divers, families snorkelling from the shacks, and Frankston-area divers who want a natural reef within fifteen minutes of home.
What you might see
Southern hulafish, bullseyes, magpie perch, old wife, leatherjackets, moonlighter, decorator crab, hermit crabs, Maori octopus, blacklip abalone, southern fiddler ray, stingarees, sand flathead, giant cuttlefish (winter), southern calamari
Location
Beach-shack-lined cove below the Ranelagh estate at Mount Eliza, reached from the end of Earimil Drive, with rocky points at both ends and Cahills Reef marked by a beacon offshore; 1.9 km south-west of Daveys Bay.
Facilities nearby
Small car park at the end of Earimil Drive; no toilets or showers; Mount Eliza village cafés 2 km; air fills at Aquability or Diveline (Frankston).
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
scubadoctor.com.auscubadoctor.com.auRecord updated 26 Sept 2026. Source claims are being reviewed.