From Virgin, UT take Kolob River Road north about 8 miles to the Left Fork Trailhead Parking area. Hike 4.5 miles on this trail to the Subway section.
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This crack appears at the beginning of the Subway and channel water down the creek for 30 feet or so. A bend in the Left Fork of North Creek, a tributary to the Virgin River, has carved out a Subway like tunnel in the sandstone creek bed.