You can find otters in rivers of all sizes, canals, lakes, marshes, and bays off the ocean. I watch otters on a large island in the middle of the St. Lawrence River, which is several miles wide where I live. I do see them in the river, for example, off Picton Island at dawn
where in those waters about 6 to 8 feet deep they often get crayfish crawling along the bottom. It's hard to see them and get video or photos of them in that great expanse of water. Here's a poor image of an otter periscoping up out of the water off an old quarry on Picton Island to get a better look at me as I floated by in a kayak.
