Maubin District, formerly known as Thun-Khwa, is a district in Ayeyarwady Division, Myanmar. It consists of 39 wards, 235 village groups and 1642 villages organized into four townships - Maubin, Pantanaw, Nyaungdon and Danuphyu. The district lies on a flat plain, cut by many streams, which is 1,362 feet above sea level. It has an area of 1651.49 square miles. The majority of the population are Burmese and Kayin nationals.