page_title: Fort Rock
hierarchical_section_title: Fort Rock
caption_attribution_description: English: Aerial photo of Fort Rock, a tuff ring in Oregon.
context_page_description: Fort Rock is a tuff ring located on an ice age lake bed in north Lake County, Oregon, United States.
  The ring is about 4,460 feet in diameter and stands about 200 feet high above the surrounding plain. Its name is derived from the tall, straight sides that resemble the palisades of a fort. The region of Fort Rock-Christmas Lake Valley Basin contains about 40 such tuff rings and maars and is located in the Brothers Fault Zone of central Oregon's Great Basin. William Sullivan, an early settler in the area, named Fort Rock in 1873 while searching for lost cattle.
context_section_description: Fort Rock is a tuff ring located on an ice age lake bed in north Lake County, Oregon, United States.
  The ring is about 4,460 feet (1,360 m) in diameter and stands about 200 feet (60 m) high above the surrounding plain. Its name is derived from the tall, straight sides that resemble the palisades of a fort. The region of Fort Rock-Christmas Lake Valley Basin contains about 40 such tuff rings and maars and is located in the Brothers Fault Zone of central Oregon's Great Basin. William Sullivan, an early settler in the area, named Fort Rock in 1873 while searching for lost cattle.
caption: Aerial view of Fort Rock from the northeast.
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