Turner, who is now in his 80s, is still one of the country's top landowners, with roughly 2 million acres to his name, the majority of which is found on 13 sprawling ranches that together host the largest privately managed bison herd in the country, numbering over 45,000, according to his official website.
Keith Robinson, along with his younger brother, Bruce, and their family plantation Gay and Robinson, own 55,000 acres of Kauai and, 17 miles west, the entire 45,000-acre private island of Niihau, which their family purchased from the Hawaiian monarchy in the mid-1800s. This is more land than Oracle cofounder Larry Ellison, who purchased the entirety of Lanai for $300 million in 2012, and 40 times more than Meta CEO Mark Zuckerberg, who's established his own 2,300-acre, $330 million outpost on the opposite side of Kauai.