The Banzai Pipeline, or simply "Pipeline" or "Pipe," is a surf reef break located in Hawaii, off Sunset Beach Park in Pupukea on O'ahu's North Shore. A reef break is an area in the ocean where waves start to break once they reach the shallows of a reef. Pipeline is notorious for huge waves which break in shallow water just above a sharp and cavernous reef, forming large, hollow, thick curls of water that surfers can tube ride.