Located in northern California, lies the Lassen National Forest. This is where the Sierra Nevada, the Cascades, the Modoc Plateau and the Great Basin meet. Within the forest, you can explore a lava tube or the land of Ishi, the last survivor of the Yahi Yana Native American tribe; watch prong-horn antelope glide across sage flats; drive four-wheel trails into high granite country appointed with sapphire lakes, or discover spring wildflowers on foot.