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Here's a map of Broome.
Now, one thing which was a bit of a problem - on the overworld map in the OP, Broome is shown to be entered from the west, and exited from the east. But because of its position on the coast, the only way to enter Broome from the east would be to approach from the north.
So, instead, I decided to have the entry come in from the south. The cave starts further west, but pulls a u-turn at the last minute to allow the player to exit into Broome.
Thoughts?