Ojo Caliente Spring, Hot spring in Yellowstone National Park, Wyoming.

Ojo Caliente Spring is a superheated, alkaline hot spring in the River Group of Yellowstone's Lower Geyser Basin, a few yards off the Fountain Flats Freight Road on the northern bank of the Firehole River. At its northern end the water boils constantly to a height of 12 to 20 inches (30 to 51 cm).

The sources record no tribal rituals or gatherings at Ojo Caliente Spring; its documented history is one of naming and description. Spanish ojo caliente, "hot eye", is the origin of the name recorded for this superheated alkaline spring in the River Group of Lower Geyser Basin, a few yards off the Fountain Flats Freight Road on the Firehole River's northern bank.

The name is Spanish for "hot eye", given to the spring in the 19th century by explorers and mapmakers working in the Firehole River drainage. It sits in the River Group of Lower Geyser Basin, a few yards off the Fountain Flats Freight Road, and is passed by walkers heading along the river bank.

Visitors must view Ojo Caliente Spring from designated safety platforms and are prohibited from direct contact with the water due to extreme temperatures that can cause severe burns upon exposure.

The name is Spanish for "hot eye". The spring sits a few yards off the Fountain Flats Freight Road on the northern bank of the Firehole River, in the River Group alongside Azure Spring, and its northern end boils constantly to a height of 12 to 20 inches (30 to 51 cm).