North of Nairobi, for example, the lush, farm-laced hills gradually give way to the semiarid landscape of the Laikipia District, 2 million acres framed to the east by Mount Kenya, to the south by the Aberdare Mountains, and to the west by the fossil-rich Great Rift Valley.
Visit Ulupalakua, Maui's second largest cattle ranch, on the slopes of Mount Haleakala, where, in the mid-1800s, ranchers cultivated sweet potatoes, taro and sugarcane in the rich, volcanic soil.