Lake / Swamp / Sea Monster
Lake, swamp, sea, and other water monsters that do not have tentacles.
If you’re looking for monster romance with characters that have tentacles, take a look at Kraken / Tentacle Monster romance.
This category also exludes mermaids, mermen, and sirens. If you’re looking for monsters with a fish tail, take a look at the Mermaid / Merman / Siren romances.