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Besides the land regions (Balenos, Serendia, Calpheon, Mediah, Valencia and Kamasylvia) of Black Desert Online there is a large waterworld to explore. This includes the islands of the world as well as the oceans themselves.

Black Desert Online - Ocean Update

Black Desert Online - Ocean Update

Travel between the islands and continent is possible by private boats or ships or public ones on a schedule. Trade ships can move items for the player as well against a fee. Pirates roam the oceans and can cause havoc the same as thieves on land when one is moving trade goods. Soon naval battles will be available.

And there is a rich underwater landscape that can be explored.