Name: The reef is marked on the SA Navy charts as "Rambler Rock". Depth: Maximum depth about 22 m on the sand at the North-west pinnacle. Top of the pinnacle is about 10 m. Marine life: The rocks are encrusted with a variety of organisms depending on depth and orientation. There are kelp and sea urchins on the tops of the pinnacles, and Red-bait and other large solitary ascidians scattered around. The steeper sides are largely covered by common feather stars, There are also occasional sea fans, some quite large. The sand is coarse and shelly near the rocks, and there are sand stars, brittle stars, sand slugs, burrowing anemones and purple sea pens on the sand. Photography: This is a good photographic site. Unless the visibility is particularly good, macro equipment will usually give the best results. Topography: North-west Pinnacle A pinnacle of very large boulders and outcrops concentrated in an area about 25 m diameters. The top of the pinnacle is at about 11 m depth. The pinnacle is surrounded by scattered small low boulders and outcrops over a larger area (About 75 m East to West, 35 m North to South), on a coarse sand bottom, at a depth of just over 24 m. Some nice gullies, crevices, overhangs and holes in the deeper areas. Particularly colourful on vertical and overhanging areas, and the topography is fairly spectacular in good visibility. North Central Reef Partly mapped section of reef between North-west pinnacle and North-east reefs. Reported to rise to the shallowest depth of about 12 m. Only the perimeter has been mapped and mostly the edges are low to medium profile granite, rising up to about 19 m in places, surrounded by sand at about 24 m. North-east Reefs Extensive fairly low profile reef with areas of moderately high profile boulders. Not very well known, but pleasantly varied. Partly mapped. The main pinnacle is a big outcrop with flat-top at about 22 m with a big boulder perched on top, rising to about 14 m, surrounded by a large area of lower reef, mostly below 21 m, with a few local shallows about 18 m. Flat sand beyond reef at about 25 to 26 m. Larger, but more spread out than the north-western pinnacle, so not as spectacular in good visibility. Southern Pinnacles Extensive granite reef. The pinnacle rises to the shallowest depth of about 8 m to the north-west of the reef. There are several areas of about 18 m depth in the central part of the reef, but most are deeper than 18 m. The profile is moderately high over a large part of the reef, and there are occasional sand-filled gulleys. Fairly extensively mapped above 24 m. Lots of sea fans and soft corals, sea cucumbers and brittle stars. Hotlips Pinnacle Granite outcrop on sand rising to about 18 m on top. Flat-topped pinnacle, with surrounding low to medium profile reef of boulders and low bedrock. Maximum depth about 30 m on the sand to the east. Large numbers of sea fans. First recorded dive on 16th February 2015. Named after the Hotlips spider crab, Achaeopsis Spinulosus, several of which were seen at this site on the first dive.