FIRST PLACE: Boiling River
SECOND PLACE: Potossi
THIRD PLACE: Firehole River

No longer a secret spot, the Boiling River is your choice for undeveloped regional hot springs. The Boiling River is just inside Yellowstone National Park from the Gardiner entrance, but you probably already knew that! A handful of man-made pools on the banks of the Yellowstone River hold hot water and allow the cool river water to flow through. Enjoy, and shhhh!