Ash Cave

A large rock shelter with a small waterfall in Hocking Hills State Park, Ohio

Ash Cave

World's Largest Cave

Son Doong cave is a cave in Phong Nha-Ke Bang National Park, Bo Trach District, Quang Binh Province, Vietnam. The cave is located near the Laos-Vietnam border and has a large fast-flowing underground river inside.

World's Largest Cave

Portugal Sea Cave

This sea cave is quite near Benagil Beach in Algarve, Portugal.

A sea cave, also known as a littoral cave, is a type of cave formed primarily by the wave action of the sea. The primary process involved is erosion. Sea caves are found throughout the world, actively forming along present coastlines and as relict sea caves on former coastlines. Some of the largest wave-cut caves in the world are found on the coast of Norway, but are now 100 feet or more above present sea level. These would still be classified as littoral caves. By contrast, in places like Thailand’s Phang Nga Bay, solutionally formed caves in limestone have been flooded by the rising sea and are now subject to littoral erosion, representing a new phase of their enlargement.

Portugal Sea Cave