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Chapter 10: Game Mastering / Environment / Aquatic

Visibility

Source Core Rulebook pg. 512 2.0
It’s much harder to see things at a distance underwater than it is on land, and it’s particularly difficult if the water is murky or full of particles. In pure water, the maximum visual range is roughly 240 feet to see a small object, and in murky water, visibility can be reduced to only 10 feet or even less.