Llao Rock is a prominent cliff on the rim of Crater Lake, rising 2000 feet above the water’s surface. It formed from Dacite lava flows off Mt. Mazama, before the formation of Crater Lake. Windblown and twisted whitebark pines are scattered around the rim. They depend upon the Clark’s nutcracker to open its cones and disperse its seeds. White pine blister rust disease, the mountain pine beetle, and infrequent catastrophic fire also affect the whitebark pine’s survival.