Silhouette of a man with a baseball cap standing next to fishing rods on the stern of a large boat inside a sea cave, Channel Islands National Park, California.

Silhouette of a man with a baseball cap standing next to fishing rods on the stern of a large boat inside a sea cave, Channel Islands National Park, California. Painted Cave is one of the largest and deepest sea caves in the world and is found on the northwest coastline of Santa Cruz Island. Named because of its colorful rock types, lichens, and algaes, Painted Cave is nearly a quarter-mile long and 100 feet wide, with an entrance ceiling of 160 feet and a waterfall over this entrance in the spring.