Punta Abtao (41°49'S., 73°21'W.), the E entrance point of Rada de Cunco, is low and slopes inland. The point is a good radar target. A drying, rocky reef extends 0.8 mile SSE of Punta Abtao. Isla Abtao, a crescent shaped island lying 0.5 mile NE of Punta Abtao, is very conspicuous at Punta Barranco (41°48'S., 73°21'W.), its NE end. Monuments stand on Punta Abato and the N end of Isla Abato. The SW end of the island is a low isthmus terminating at Punta Quilque (41°50'S., 73°21'W.), off which foul ground extends 0.5 mile.

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