A polity located on the east coast of Sumatra. Also known as Haru. Mills (1970: 114-15, 184) notes it as being located in the Deli district. For a study of diverse references to Aru, see Milner, McKinnon and Luckman (1978). For information on further Chinese sources relating to this polity, see Chen, Xie and Lu (1986; 317-18, 902).