I think that you mean where a river meets the ocean? Since the ocean and the sea are the same thing. It is called an estuary.
At the coast. This is the term for where land meets the sea.
It is at sea level where the Pacific Ocean meets in the west. sea level where pacific ocean meets in the west
Estuary
delta
The intertidal zone is where the ocean meets the land - sometimes it is submerged and at such as herbivorous snails, crabs, sea stars, and small fishes.
a floodplane is when a river meets the sea or ocean
delta
delta
Where it meets the Atlantic Ocean, the Indian Ocean & the Mediterranean Sea.
The Atlantic ocean one the east side meets the Indian Ocean on the west. Travel south and you come to the Southern ocean.
A Delta
the pacific ocean is a sea