Shangri-La is a fictional place described in the 1933 novel Lost Horizon by British author James Hilton. Hilton describes Shangri-La as a mystical, harmonious valley, gently guided from a lamasery, enclosed in the western end of the Kunlun Mountains. Shangri-La has become synonymous with any earthly paradise, and particularly a mythical Himalayan utopia – a permanently happy land, isolated from the outside world. In the novel, Hugh Conway, a veteran member of the British diplomatic service, finds inner peace, love, and a sense of purpose in Shangri-La, whose inhabitants enjoy unheard-of longevity. Among the book's themes is an allusion to the possibility of another cataclysmic world war brewing. It is said to have been inspired at least in part by accounts of travels in Tibetan borderlands, published in National Geographic by the explorer and botanist Joseph Rock. The remote communities he visited, such as Muli, show many similarities to the fictional Shangri-La.