True. True. Most of the times we call the River Police is when we see not so much tons of lakes with no ingress or egress, but when we see rivers join split, etc, or lakes drain vi more than one outlet. Things that normally just don't do that.
Of, course, things being as they are, we can point to MANY things in the real world that just breaks the rules. The Dead Sea for example being a body of water that does not drain to the sea/ocean. The Nile River Delta, being an hundred+ miles of splitting river as it flows to the sea, etc.