The Brothers and Sisters Rocks – not to be confused with the Sisters Rocks off the Forestier Peninsula – are a group of rocks at the head of Wedge Bay on the western side of the Tasman Peninsula. The Marine Life Network guide describes an easy shore dive in 8-17 m from a pebbly beach, over a gently sloping reef with a seaweed garden, and records octopus, hermit crabs and reef fish. It is the most accessible of the Wedge Bay sites for divers without a boat.

The reef slopes gradually away from the beach and is covered in brown and red algae, with sand channels and scattered boulders. Octopus hide in holes in the reef, hermit crabs and sea stars cover the sand, and wrasse, leatherjackets and small schools of fish feed along the reef edge. It is a sheltered site: the head of Wedge Bay is protected from the southerly swell that affects Storm Bay, making it a reliable option for training, easy dives and night dives.

Visibility is modest, as is typical for Storm Bay, and drops after westerly blows. The site is quiet and seldom documented, so ask locally about the best entry and parking. Combine it with a boat dive at Wedge Island or Fosters Rock, or use it as an easy shore dive during a stay at White Beach or Nubeena.

Because it can be dived without a boat or an operator, it is a good choice for independent divers who have filled cylinders in Hobart and want an easy dive on the way to or from the peninsula's southern attractions.

Nubeena is on the western side of the Tasman Peninsula, about 1 hour 30 minutes from Hobart: take the Arthur Highway to Port Arthur's turn-off near Taranna and follow the B37 (Nubeena Road) west. There are boat ramps at Nubeena and White Beach. The Marine Life Network guide places the Brothers and Sisters Rocks at the head of Wedge Bay with shore entry from a pebbly beach; follow the coastal road around the bay between Nubeena and White Beach and look for roadside parking near the rocks.

The walk to the water is short. Local residents can point out the rocks.

Wedge Bay and the White Beach–Nubeena coast face west and south-west into Storm Bay and the mouth of the Derwent. North-westerly to south-westerly winds and southerly groundswell make the outer sites rough and stir up the sand; easterly and north-easterly winds, which blow out the Tasman Sea coast, leave this side of the peninsula calm, so it complements Eaglehawk Neck. Visibility is generally lower than on the east coast (5-15 m) and drops after westerly blows.

Best in the calm mornings of late summer and autumn. The head of Wedge Bay is sheltered from southerly swell and only westerly winds put chop on the beach.

Enter from the pebble beach, swim out over the seaweed garden and follow the reef down the slope to 12-15 m, then turn and return along a shallower contour.

No operator trips; independent shore divers and snorkellers.