Water Bodies Inconsistent

Some smaller rivers and sounds are colored different than the land, while larger rivers, sounds and oceans are not. See attached examples.

macOS Tahoe 26.2
Python 3.14.2

San Diego has a bay that runs through the middle of this image and an ocean on the left.

Providence has a wide river in the bottom center.

The entire bottom right of this image is the Atlantic Ocean.

Bottom right of this one is mostly water too.

I think this could do the job if PR will be accepted: #159

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