Grand Prismatic Spring

Grand Prismatic Spring, located in Midway Geyser Basin, has the distinction of being Yellowstone National Park’s largest hot spring (no soaking though), and the third largest in the world. Measuring approximately 370 feet in diameter and is over 121 feet deep, crowds are drawn to this easily accessible Yellowstone attraction to see the massive spring's rainbow of colors and be inspired by the grand size of this thermal spring. Yellowstone National Park