The port of registration.
I parked my boat at a harbor
i went to the harbor The boat anchored near the harbor.
The boat motored into the harbor. The harbor was full of sailboats.
A harbour boat is of course called a harbour boat.
Depends on your boat
uss Arizona
by boat
Boat from Lith Harbor.
USS Arizona.
You take a boat from the Pueltown Harbor
he got it at the harbor
By tour boat.