The Sequoia High Sierra Camp is located on private property in the Giant Sequoia National Monument, between Sequoia and Kings Canyon National Parks. It's approximately half way between Los Angeles and San Francisco. From Fresno, take Hwy 180 east. You'll travel about 30 miles on main roads and another 10 miles on side roads (part unpaved) to reach the Marvin Pass Trailhead.
If you're flying in from out of state, the closest airport is in Fresno.
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