The blue water spring is about 13 feet in diameter and 1 foot below the rim, USGS said. The water in the pool was measured at ...

Outside of Yellowstone National Park is a lesser-visited area that offers visitors many opportunities for outdoor adventures ...

Thermal water in Yellowstone also contains an abundance of arsenic, mercury, and fluoride at levels that are unsafe for human consumption. These pools may also host microorganisms and pathogens such ...