Le parc national de Yellowstone aux Etats-Unis créé en 1872, couvre près de 9 000 km2, dont 96 % se trouve dans le Wyoming. Yellowstone concentre plus de la moitié des phénomènes géothermiques du monde et on compte plus de 300 geysers. Old Faithful « le vieux fidèle » est l’un des geysers situé dans le parc.
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