"Grand Prismatic hot Spring" is located in the Midway Geyser Basin, Yellowstone National Park, Teton County. It is the largest hot spring in the United States. And the third largest in the world.
The reason for calling this name, because the colors of the hot springs have a distinctive color. It's color like to a rainbow of light, red, orange, yellow, green and blue. This beautiful color is caused by algae and the bacteria that grow thickly together, because of the proper temperature and element, resulting in a variety of shades of color. It making look beautiful, colorful, distinctive Laos like on other stars.