Thanks again to The Kampot Survival Guide for use of this "Not a Map"
Kampot's "River" is actually a collection of rivers connecting directly to the nearby ocean. The rivers flow in both directions, (up to a point) depending on the tide. Sometimes the river is salty, sometimes not. Occasionally during the rainy season, July through October, the whole town of Kampot is a river, as the water overflows the banks.
... and most of the hotels, villas, bungalows on the riverfront rent out various
boats / kayaks / paddleboards
(or they're free for guests)