Tropical world covered in dense jungle vegetation with the exception of the polar caps. An elliptical orbit causes the planet to plunge into three-year-long summers and winters every 25 years respectively: the polar ice caps melt and cause widespread flooding of the main oceans during the former, and reform again during the long winter. The rest of the time the planet remains tropically humid. Natives measure their lifespan by the seasonal changes: an individual can expect to see two summer floods and one winter, or two winters and one summer flood, in his lifetime. A “summer-child” born during or close to a summer is believed to possess different qualities from that of a “winter-child”.