Maputo Province

Maputo Province occupies the southernmost corner of Mozambique, where the country tapers to a narrow coastal strip between the Lebombo Mountains and the Indian Ocean before meeting the South African border at the Ponta do Ouro crossing. The province's coastline runs for roughly 200 km from the Mozambique-South Africa border in the south to the Limpopo River delta system in the north, enclosing Maputo Bay — Delagoa Bay in the colonial charts — one of the largest natural harbours on the African continent. The tidal regime along the Maputo Province coast is among the most energetic on the Indian Ocean rim. The Mozambique Channel, the 1,700 km-long body of water separating Mozambique from Madagascar, focuses and amplifies tidal energy as it constricts toward its southern exit. Spring tidal range at Maputo city is 3.5 to 4.0 m, dropping slightly to around 3.5 m at the southern beaches; neap range runs 1.7 to 2.0 m. The regime is semidiurnal — two highs and two lows per day of broadly similar magnitude. This is a macrotidal coast by any conventional definition, and the consequences are visible across the entire shoreline: broad intertidal flats exposed at low water, mangrove systems in the bay margins, and beaches that vary by hundreds of metres in width between spring high and spring low. Delagoa Bay covers around 600 km² and is fringed by mangrove on its northern and western margins. The bay is shallow over much of its extent — depths of 2 to 5 m over large areas at chart datum — which means the large tidal range produces correspondingly large currents at the harbour approaches and in the channels between the bay's islands and sandbanks. Inhaca Island, the main island in the bay, has a marine research station that has operated since 1950 and represents one of the longest continuous records of coastal ecology in East Africa. The southern coast at Ponta do Ouro and Ponta Malongane faces directly onto the Indian Ocean and is backed by high dune systems stabilised by coastal forest. The continental shelf narrows here and drops relatively quickly to open-ocean depths; the dive sites on the outer reef at Malongane and the adjacent rocky reefs are exposed to the full Indian Ocean swell window. Bull sharks, tiger sharks, and whale sharks are documented at these sites, along with the resident bottlenose and Indo-Pacific humpback dolphin populations that have made the Ponta do Ouro bay one of the most-visited dolphin encounter destinations in southern Africa. Instituto Nacional de Hidrografia e Navegação (INAHINA) publishes Mozambican tide tables and is the authoritative hydrographic source for the region. Predictions on TideTurtle come from Open-Meteo Marine, a gridded global ocean model; accuracy is typically within plus or minus 45 minutes on timing and 0.2 to 0.3 m on height above chart datum.