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| Grand Prismatic Spring (left) and Excelsior Geyser (right). Grand Prismatic Spring displays a stunning rainbow of colors created by species of thermophilac (heat-loving) bacteria that thrive in narrow temperature ranges. The blue water in the center is too hot to support any bacterial life, while the outer orange rings are the coolest water. Grand Prismatic Spring is the largest spring in the United States and the third-largest in the world. Midway Geyser Basin. Image ID: 13571 Location: Midway Geyser Basin, Yellowstone National Park, Wyoming, USA | Old Faithful geyser, sunrise. Reaching up to 185' in height and lasting up to 5 minutes, Old Faithful geyser is the most famous geyser in the world and the first geyser in Yellowstone to be named. Image ID: 26939 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | A rainbow appears in the spray of Riverside Geyser as it erupts over the Firehole River. Riverside is a very predictable geyser. Its eruptions last 30 minutes, reach heights of 75 feet and are usually spaced about 6 hours apart. Upper Geyser Basin. Image ID: 13367 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Old Faithful geyser. Reaching up to 185' in height and lasting up to 5 minutes, Old Faithful geyser is the most famous geyser in the world and the first geyser in Yellowstone to be named. Image ID: 26945 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Clepsydra Geyser, a geyser which is almost continually erupting. A member of the Fountain Group of geothermal features. Image ID: 26947 Location: Lower Geyser Basin, Yellowstone National Park, Wyoming, USA | Morning Glory Pool has long been considered a must-see site in Yellowstone. At one time a road brought visitors to its brink. Over the years they threw coins, bottles and trash in the pool, reducing its flow and causing the red and orange bacteria to creep in from its edge, replacing the blue bacteria that thrive in the hotter water at the center of the pool. The pool is now accessed only by a foot path. Upper Geyser Basin. Image ID: 13352 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Crested Pool is a blue, superheated pool. Unfortunately, it has claimed a life. It reaches a overflowing boiling state every few minutes, then subsides a bit before building to a boil and overflow again. Upper Geyser Basin. Image ID: 13355 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Old Faithful geyser at sunset, at peak eruption. Image ID: 13361 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | A crowd enjoys watching Old Faithful geyser at peak eruption. Image ID: 13363 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Riverside Geyser at peak eruption, arcing over the Firehole River. Riverside is a very predictable geyser. Its eruptions last 30 minutes, reach heights of 75 feet and are usually spaced about 6 hours apart. Upper Geyser Basin. Image ID: 13366 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | A visitor videotapes the eruption of Lion Geyser, with Old Faithful Inn visible in the distance. Lion Geyser, whose eruption is preceded by a release of steam that sounds like a lion roaring, erupts just once or a few times each day, reaching heights of up to 90 feet. Upper Geyser Basin. Image ID: 13371 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Daisy Geyser erupting with visitors visible in the distance.. Daisy Geyser, a cone-type geyser that shoots out of the ground diagonally, is predictable with intervals ranging from 120 to over 200 minutes. It reaches heights of 75 feet, lasts 3 to 4 minutes and rarely erupts in concert with nearby Splendid Geyser. Upper Geyser Basin. Image ID: 13382 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Sawmill Geyser erupting. Sawmill Geyser is a fountain-type geyser and, in some circumstances, can be erupting about one-third of the time up to heights of 35 feet. Upper Geyser Basin. Image ID: 13385 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Castle Geyser erupts, reaching 60 to 90 feet in height and lasting 20 minutes. While Castle Geyser has a 12 foot sinter cone that took 5,000 to 15,000 years to form, it is in fact situated atop geyserite terraces that themselves may have taken 200,000 years to form, making it likely the oldest active geyser in the park. Upper Geyser Basin. Image ID: 13417 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Castle Geyser erupts with the colorful bacteria mats of Tortoise Shell Spring in the foreground. Castle Geyser reaches 60 to 90 feet in height and lasts 20 minutes. While Castle Geyser has a 12 foot sinter cone that took 5,000 to 15,000 years to form, it is in fact situated atop geyserite terraces that themselves may have taken 200,000 years to form, making it likely the oldest active geyser in the park. Upper Geyser Basin. Image ID: 13426 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Grand Geyser erupts (right) with a simultaneous eruption from Vent Geyser (left). Grand Geyser is a fountain-type geyser reaching 200 feet in height and lasting up to 12 minutes. Grand Geyser is considered the tallest predictable geyser in the world, erupting about every 12 hours. It is often accompanied by burst or eruptions from Vent Geyser and Turban Geyser just to its left. Upper Geyser Basin. Image ID: 13457 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Ledge Geyser, vents releasing steam, in the Porcelain Basin area of Norris Geyser Basin. Image ID: 13484 Location: Norris Geyser Basin, Yellowstone National Park, Wyoming, USA | White Dome Geyser rises to a height of 30 feet or more, and typically erupts with an interval of 15 to 30 minutes. It is located along Firehole Lake Drive. Image ID: 13540 Location: Lower Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Pink Cone Geyser erupts. Pink Cone Geyser reaches 30 feet in height, and has highly variable interval and duration. It is a cone-type geyser and its cone has a pinkish tint due to manganese oxide in it. Firehole Lake Drive, Lower Geyser Basin, Yellowstone Park. Image ID: 13551 Location: Lower Geyser Basin, Yellowstone National Park, Wyoming, USA | Grand Prismatic Spring displays a stunning rainbow of colors created by species of thermophilac (heat-loving) bacteria that thrive in narrow temperature ranges. The blue water in the center is too hot to support any bacterial life, while the outer orange rings are the coolest water. Grand Prismatic Spring is the largest spring in the United States and the third-largest in the world. Midway Geyser Basin. Image ID: 13573 Location: Midway Geyser Basin, Yellowstone National Park, Wyoming, USA | Grand Prismatic Spring displays brilliant colors along its edges, created by species of thermophilac (heat-loving) bacteria that thrive in narrow temperature ranges. The outer orange and red regions are the coolest water in the spring, where the overflow runs off. Midway Geyser Basin. Image ID: 13587 Location: Midway Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Grand Prismatic Spring displays brilliant colors along its edges, created by species of thermophilac (heat-loving) bacteria that thrive in narrow temperature ranges. The outer orange and red regions are the coolest water in the spring, where the overflow runs off. Midway Geyser Basin. Image ID: 13591 Location: Midway Geyser Basin, Yellowstone National Park, Wyoming, USA | Steam rises above the Midway Geyser Basin, largely from Grand Prismatic Spring and Excelsior Geyser. The Firehole River flows by. Image ID: 13605 Location: Midway Geyser Basin, Yellowstone National Park, Wyoming, USA | Orange Spring Mound. Many years of mineral deposition has built up Orange Spring Mound, part of the Mammoth Hot Springs complex. Image ID: 13614 Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA |
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| New Blue Spring and its travertine terraces, part of the Mammoth Hot Springs complex. Image ID: 13623 Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Grand Prismatic Spring steams in cold winter air. Image ID: 19593 Location: Midway Geyser Basin, Yellowstone National Park, Wyoming, USA | White Dome Geyser, rises to a height of 30 feet or more, and typically erupts with an interval of 15 to 30 minutes. It is located along Firehole Lake Drive. Image ID: 26949 Location: Lower Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Grand Prismatic Spring displays brilliant colors along its edges, created by species of thermophilac (heat-loving) bacteria that thrive in narrow temperature ranges. The outer orange and red regions are the coolest water in the spring, where the overflow runs off. Image ID: 07265 Location: Midway Geyser Basin, Yellowstone National Park, Wyoming, USA | Morning Glory Pool has long been considered a must-see site in Yellowstone. At one time a road brought visitors to its brink. Over the years they threw coins, bottles and trash in the pool, reducing its flow and causing the red and orange bacteria to creep in from its edge, replacing the blue bacteria that thrive in the hotter water at the center of the pool. The pool is now accessed only by a foot path. Upper Geyser Basin. Image ID: 07268 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Anemone Geyser erupts, Old Faithful Inn visible in the distance. Anemone Geyser cycles about every 7 minutes. First the pools fills, then overflows, then bubbles and splashes before erupting. The eruption empties the pools and the cycle begins anew. Upper Geyser Basin. Image ID: 13394 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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