No picture of the giant sequoia trees in Yosemite National Park manages to fully capture their immense size and majesty. You’ll just need to see them for yourself. Let us introduce you to some of the unique giant sequoia groves in the Yosemite Mariposa County area – the Merced, Tuolumne, and Mariposa Groves are inside Yosemite National Park, and the Nelder Grove is just outside the park boundary to the south.