The island's dimensions are approximately 12 km by 7 km. The highest point above sea level is the Mount Inhaca on the north-eastern shoreline. The south-western peninsula is known as Ponta Punduine while Ponta Torres to the south-east approaches the mainland. Two inland swamps occur at the northerly airstrip and southern Nhaquene respectively. Besides Inhaca settlement on the western shore there are five smaller villages including Inguane, Nhaquene, Ridjeni and Tobia.
History
Despite being a part of the Portuguese Mozambique until 1975, the island of Inhaca, so close to the harbour of Maputo, was occupied by the British from 1823 until the MacMahon Treaty of 24 July 1875. The British used the island to patrol and control the slave traffic in the region.
Ecology
Flora
The island is regular destination for ecotourists and ecological researchers. The central land area consists of cultivated fields, while grassy plains are found to the north, flanked by protected usnea-covered dune forests along the eastern and western shores. Extensive exposed mudflats fringe the western and southern shores at low tide. Mangroves cover large sections of the northern shores and southern Saco Bay. The sub-tropical evergreen forest on the island includes the following tree species: Sideroxylon inerme, Apodytes dimidiata, Euclea schimperi, Manilkara discolor, Dovyalis rhamnoides, Dovyalis tristis, Diospyros natalensis, Clausena anisata, Cassine papillosa, Olea africana, Ficus burtt-davyi, Ficus sansibarica, Ficus capensis, Commiphora neglecta, Commiphora schlechteri, Allophylus melanocarpus, Erythroxylon emarginatum, Vepris undulata, Deinbollia oblongifolia, Scolopia ecklonii, Thespesia populnea and Galpinia transvaalica.
Although humpback whales migrate seasonally past these shores whale watching has never become a popular attraction here. The ocean is generally too rough and the whales too far out, while the hiring boats is too expensive for the average person. Southern right whales have become rare today, though whales were historically abundant before they were wiped out by commercial and illegal hunts including mass illegal hunts by the Soviet Union and Japan in the 1960s and 1970s. Resident populations of the Indo-Pacific humpbacked dolphin and the Indian Ocean bottlenose dolphin occur in the waters around the island. The bottlenose dolphin's abundance fluctuates seasonally, increasing during the austral winter. The humpback dolphin is more resident, living in extremely shallow inshore areas of the western and southern coasts, and form larger groups than recorded elsewhere in southern Africa. Bottlenose dolphins frequent the waters of the northwestern coast, and their group size varies largely from individuals and pairs to hundreds of dolphins. A very small, remaining population of dugong also occur here. Two species of sea turtles visit the eastern shores in summer to breed. Inhaca is home to about 300 bird species, both resident and migratory. Species of conservation concern are the pink-backed pelican, lesser crested tern, crab plover, greater sand plover, Mongolian plover, Terek sandpiper, southern banded snake eagle, mangrove kingfisher, grey-rumped swallow and spotted ground thrush. The southerly Nhaquene Swamp and Saco Bay are strongholds for the sooty falcon, while terns roost on northerly Portuguese Island. Bird species of limited distribution are Rudd's apalis, Neergaard's sunbird and pink-throated twinspot. House crows are present since the 1970s.
