No, not Nessie but an endangered species.

This creature has very low numbers around the world. It lives near mangrove forest.
Population numbers


? Malampaya Sound, Philippines: 77
? Mekong River: 78-91
? Mahakam River, Indonesia: 87
? Ayeyarwady River, Myanmar: 58-72
? Coastal waters of Bangladesh: 5,383
? Sundarbans mangrove forest of Bangladesh: 451

Where I am is not even mentioned.  Santubong river mouth Sarawak, Borneo, Malaysia. Honestly, there were some there. Sorry about the quality of the photo but it was evening and the dolphins only broke the surface for milliseconds. The locals call them the two second dolphin because they don't stay on the top of the water. Personally I think it should be 2 milliseconds. To see a proper photo the WWF has a page here.
We went on a evening safari boat ride. The trip included big groups of fireflies in the trees by the water and proboscis monkeys settling down in the evening light to find places to sleep. Overall an excellent trip.