How do I know if water is fresh or salt?

In New World there are different fish and bait for each water type. That said, it's somewhat hard to tell what water type is which. Obviously a beach is saltwater and a landlocked lake is freshwater, but It's a bit harder to tell when the areas mix.

For example, there's a bay/lake/gulf/river thing near First light that surrounds the Fort Island. Is that fresh or salt?