Home to several giant sequoia groves and the General Grant Tree, the world's second largest measured tree, this park also features part of the Kings River, sculptor of the dramatic granite canyon that is its namesake, and the San Joaquin River, as well as Boyden Cave. Although Kings Canyon National Park was designated as such in 1940, it subsumed General Grant National Park, which had been established on October 1, 1890 as the United States' fourth national park.