From the Wikipedia page 
Matutuíne District is a district of Maputo Province in southern Mozambique. The principal town is Bela Vista. The district is located in the south of the province, and borders with the city of Maputo in the north, the province of KwaZulu-Natal of South Africa in the south, Swaziland in the west, and with Namaacha and Boane Districts in the northwest. In the east, the district is limited by the Indian Ocean. The area of the district is 5,387 square kilometres (2,080 sq mi). This is the southernmost district of Mozambique.