The difference is a bay is rounder and not so narrow.
a firth is long and narrow and a bay is round and wider.
A firth is a narrow inlet of the sea that is usually surrounded by land on three sides, while a bay is a body of water partially enclosed by land but more open than a firth. Bays tend to have a wider opening to the ocean than a firth and are typically more sheltered.
bay
straitbay
you're ugly
The Antonine Wall is between Firth of Forth and Firth of Clyde.
The Antonine Wall is in Scotland, between the Firth of Forth and the Firth of Clyde.
Montego Bay is 2 hours ahead of Calgary.
The Antonine Wall is in Scotland, between the Firth of Forth and the Firth of Clyde.
A Scottish bay like this is called a firth.
The Chesapeake Bay Bridge-Tunnel
a pennisula is surrounded by water on three sides a bay is sorrounded by water on one side
The pentland firth