A natural harbor.
A safe harbour.
These are generally called "Natural Harbors"
harbor
Harbor
A sheltered body of water where ships harbor is called a harbor or a port.
unknown
small sheltered bay
It is called a harbor, which can be natural or artificial.
Most Greeck lived along the coast (by water) with it may excellent harbor (a part of a body of water near a coast in which ships can anchor safely; dock/park ships)
Gravity causes the ships iron anchor to sink to the ocean.
Ahole
seaport