Firehole Canyon Drive est une route à sens unique de 3,2 km au sud de Madison, au large de la Grand Loop. Elle offre un point de vue sur une cascade et une zone de baignade.

Norris Geyser Basin is the hottest and most changeable thermal area in Yellowstone. We will explore many of the features you would see if you walked the 2 1/4 miles (3.6 km) of trails. Discover the location of the world's tallest active geyser, colorful hot springs, and microscopic life in one of the most extreme environments on earth.

Gibbon Falls drops 84 feet (0.3 m) over a remnant of the Yellowstone caldera rim. The caldera was created by a massive volcanic eruption approximately 640,000 years ago. A quick stop on our drive of the lower loop, this is a great opportunity for a photo moment.

Old Faithful est situé dans l'Upper Geyser Basin de Yellowstone, dans la partie sud-ouest du parc. La zone d'observation des geysers est la plus accessible et la plus conviviale du parc, avec des bancs, un grand parking et un poste de garde forestier qui enregistre l'heure, la hauteur et la durée des éruptions afin de prédire la prochaine.

Le long du sentier Fountain Paint Pot, vous découvrirez diverses formations hydrothermales, témoins du volcan toujours actif de Yellowstone. Au sein de ce système géologique, chaque type de formation thermale est représenté. On peut les regrouper en deux grandes catégories : celles riches en eau (sources chaudes et geysers) et celles qui en contiennent peu (mares de boue et fumerolles). Malgré leurs similitudes structurelles, aucune formation n'est exactement identique.

La source Grand Prismatic est située dans le bassin du geyser Midway. Elle a la particularité d'être la plus grande source chaude du parc. Elle mesure environ 112,8 m de diamètre et plus de 37 m de profondeur. Une description de cette source par le trappeur Osborne Russell en 1839 en fait également la plus ancienne source thermale décrite et clairement identifiable de Yellowstone.

Situated at 7,733 feet (2,357 m) above sea level, Yellowstone Lake is the largest high elevation lake (above 7,000 feet / 2,134 m) in North America. It is roughly 20 miles (32.2 km) long and 14 miles (22.5 km) wide, with 141 miles (227 km) of shoreline and a surface area of 132 square miles (342 km2). Yellowstone Lake freezes over completely every winter in late December or early January, with ice thicknesses varying from a few inches to more than two feet. The lake usually thaws in late May or early June. Yellowstone Lake remains cold year-round, with an average water temperature of 41°F (5°C). Because of the extremely cold water, swimming is not recommended. Survival time is estimated to be only 20 to 30 minutes in water at this temperature.

Yellowstone itself is a volcano, and one of its most spectacular eruptions occurred 640,000 years ago. During the eruption, the land collapsed and left a large depression in the earth—the Yellowstone Caldera. This caldera filled with lava flows over hundreds and thousands of years creating the volcanic plateau that comprises much of the central part of the park. Here at Mud Volcano you are close to one of the resurgent domes. The hills you see east of here comprise Sour Creek Dome. Resurgent domes are areas of active ground deformation, where the land moves up or down with the fluctuation of the magma chamber below. Scientists monitor these domes closely for information about ongoing volcanic activity. Not surprisingly, many of the park’s geysers, hot springs, mudpots, and fumaroles are also found near or within the caldera.

The Grand Canyon of the Yellowstone River expresses the park's complex geologic history in dramatic colors and shapes. Puffs of steam mark hydrothermal features in the canyon's walls. The Upper and Lower Falls of the Yellowstone River add to the grandeur of the unique natural treasure.

Hayden Valley is a large, sub-alpine valley in Yellowstone National Park straddling the Yellowstone River between Yellowstone Falls and Yellowstone Lake. The valley floor along the river is an ancient lake bed from a time when Yellowstone Lake was much larger.