How are we sure that creature location for bessie (se/algea) only one of 4 possible locations? but we don't know the other 3. I've never heard of multiple locations being possible.
At this point, monsters can be caught in any one of 3 or 4 specific regions on the map. The exact location also appears to be fairly well-defined: if you check the official Discord server for monster locations, often people post pictures of where they have spotted the bubbles using monster bait, and I've caught several monsters at these exact locations for those specific days.
