The phrase "small cave" refers to a small, usually enclosed, natural space in the earth or rocks that can be explored or used for various purposes. Full definition
There are also small caves along the beach that are perfect if you want to hide from the sun. (loveholidays.com)
You avoid flying rocks, electrical traps, and small caves as you push your way towards first place. (pixel-mixers.com)
They live on the reef and in small caves in the Turtle Grass beds, but being a very good eating crab, they have been significantly reduced in numbers. (AmbergrisCaye.com)