I live in south Florida. Otters are relatively common in the swamps and along rivers, but not in the parks, like in Singapore!
River otters are also as far north and mid-north Quebec. I've seen them when paddling in northern waters. Maine...lots of otters.
We have a small pond, interrupting a very small creek. The otters seem to have a range of small creeks and they make the rounds. Our little pond, while full of fish, isn't enough to support continuous residency of any of the wildlife. They come and go and it is always interesting.
I think the funniest thing I ever saw was a baby otter just learning to fish. He had caught a fish, but couldn't figure out how to swim with his head above the water and hold onto the fish (bigger than his head) at the same time. Had it been on you tube it would have gone viral.
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The river is the melody
And sky is the refrain - Gordon Lightfoot