Located in Yellowstone National Park. This is the largest hot spring in the United States and the third largest in the world. The colorful foreground is the microbial mat consists of pigmented bacteria. The blue green background is the hot spring itself. The spring is approximately 250 by 300 feet in size and is 160 feet deep. The spring discharges an estimated 560 gallons (2000 liters) of 160°F (71°C) water per minute.