The Ledges is a Montague Island site on the eastern side of the island, described by the Marine Life Network as a series of underwater cliffs in relatively shallow water, away from the strong currents of the northern end. With a depth of about 18 m, it offers wall-like topography without the depth and current of sites such as The Keyhole or The Pinnacles.

Each ledge is a step of rock with a vertical or undercut face, the tops covered in kelp and the faces in sponges, sea squirts, anemones and encrusting algae. The undercuts shelter eastern blue devilfish, bullseyes, crayfish and wobbegongs, and Port Jackson sharks are common in winter. Over the ledges, schools of yellowtail, sweep and one-spot pullers mill about, blue groper and red morwong patrol, and kingfish and trevally sometimes sweep through. Because the eastern side faces open ocean, visibility can be excellent on the right day.

The site suits Open Water divers with some ocean experience and is a good alternative when current makes the northern sites unsuitable. It needs westerly weather to be calm, which is more common in autumn and winter. There is no published position, so the site is dived with Narooma operators. The limited published description means depths here are indicative. The eastern side also sees fewer boats than the northern sites, so divers often have the ledges to themselves. It is a good place for wide-angle wall shots with schooling fish when the visibility is up, and whales passing on their winter migration are sometimes heard underwater.

Boat access only. Narooma Charters leaves from the Narooma town wharf on Wagonga Inlet (about 25 minutes to the island) and Underwater Safaris from Narooma marina; private boats launch at the Apex Park or Bar Beach ramps inside the inlet. Every trip crosses the Narooma bar, one of the most dangerous on the NSW coast, so departures depend on bar conditions; Bermagui harbour (about 24 km by sea) is the fallback launch point.

The Ledges are on the eastern (seaward) side of the island, so they are dived in westerly weather when that side is calm.

Montague Island is about 9 km offshore and fully exposed, but operators can usually find a sheltered side. The main limit is the Narooma bar, which closes in moderate easterly or southerly swell, especially on a run-out tide, so trips are often delayed or cancelled. Currents are strongest around the northern and eastern sides.

The eastern side faces the open Tasman Sea and is diveable mainly on westerly days after small swell; the Marine Life Network notes it is away from the strong northern currents.

Descend at the top of the ledges and work along the series of cliffs at 10–18 m, dropping down each face and checking the undercuts, then return shallower along the tops to the boat. Use a torch in the undercuts and do the safety stop on the ledge tops.

Listed by the Marine Life Network; dived by Narooma operators when the eastern side is calm.