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Zion Canyon is a deep and narrow gorge in southwestern Utah, United States, carved by the North Fork of the Virgin River. Nearly the entire canyon is located within the eastern half of Zion National Park. The beginning of the canyon is usually delineated as the Temple of Sinawava, a vertical-walled natural amphitheater nearly 3,000 feet deep. The canyon actually begins much further upstream, however, and runs southward about 16 miles through the Narrows to reach the Temple, where the North Fork plunges over a tall waterfall. The gorge then runs southwest through the national park, approaching 2,000 feet deep in places. While the canyon rim is dominated by desert, the canyon floor supports a forest and riparian zone watered by the North Fork Virgin River.