A remarkable feature of Southeast Asia is the different ways people have adapted to local environments. In premodern times many nomadic groups lived permanently in small boats and were known as orang laut, or sea people. The deep jungles were home to numerous small wandering groups, and interior tribes also included fierce headhunters. In some of the islands of eastern Indonesia, where there is a long dry season, the fruit of the lontar palm was a staple food; in other areas, it was sago. On the fertile plans of Java and mainland Southeast Asia sedentary communities grew irrigated rice; along the coasts, which were less suitable for agriculture because of mangrove swamps, fishing and trade were the principal occupations. Due to a number of factors—low populations, the late arrival of the world religions, a lack of urbanization, descent through both male and female lines—women in Southeast Asia are generally seen as more equal to men that in neighboring areas like China and India.