Yangon Region is an administrative region of Myanmar. Located in the heart of Lower Myanmar, the division is bordered by Bago Region to the north and east, the Gulf of Martaban to the south, and Ayeyarwady Region to the west. Yangon Region is dominated by its capital city of Yangon, the former national capital and the largest city in the country. Other important cities are Thanlyin and Twante. The division is the most developed region of the country and the main international gateway. The division measures 10,170 km2 (3,930 sq mi).