This is an inlet of the sea

an alluvial deposit at the mouth of a river

Flat zone extending from the shore beneath the ocean surface

Gently sloping surface lying seaward of the continental shelf

Shallow water areas close to the continent?

an undersea hill or mountain

A ring shaped coral reef surrounding a lagoon

Deepest parts of the ocean located on the edge of convergence zones

Deep canyon cut into the continental shelf and slope