Introduces the sea, describes the different zones and marine animals that can be found there, and offers suggestions for what people can do to protect them.

"At the beach with Pete and his family, Larry the lovable pup follows a crustacean toward the sea and is swept out by a wave. He dog paddles around, exploring the plant and animal life before coming face-to-face with an oceanographer who leads him on a thrilling adventure through the four zones of the ocean before he's finally reunited with his best friend, Pete, back at the beach."--