Mount Adams is a potentially active stratovolcano in the Cascade Range and the second-highest mountain in the state of Washington, USA. Adams is a member of the Cascade Volcanic Arc, one of the arc's largest volcanoes and is located in a remote wilderness approximately 31 miles (50 km) east of Mount St. Helens. The Mount Adams Wilderness comprises the upper and western part of the volcano's cone. The eastern side of the mountain is part of the Yakama Nation.
Adams' asymmetrical and broad body rises a mile and a half (2.4 km) above the Cascade crest and its nearly flat summit looks as if the volcano was decapitated (which it in fact has not been). Air travelers flying the busy routes above the area sometimes confuse Mt. Adams with nearby Mt. Rainier, which has a similar flat-topped shape.