The west coast of the Bay of Isles is roughly C-shaped. Its northernmost point is the rugged headland Cape Buller; Cleveland Rock sits nearby. Pyramid Peak rises over the cape. Just southeast of the cape sits Barlas Bank, a small submarine bank. At the top of the C-shape, Koppervik cove indents the north coast of the west side of the bay, with Breakwater Point marking the cove's west edge.