Inhaca Island tide times

Inhaca Island lies 40 km east of Maputo in Delagoa Bay, accessible by ferry from the Maputo waterfront in approximately 90 minutes or by light aircraft in 15 minutes. The island covers 36 km² and holds roughly 6,000 residents, the marine research station of Eduardo Mondlane University — established in 1950, one of the oldest continuously operating marine biological stations in East Africa — and an ecological reserve covering the northern end of the island.

The contrast between the island's two coasts is among the most instructive demonstrations of tidal influence available anywhere on the Mozambican coast. The western coast faces Maputo Bay across a sheltered channel: mangrove fringes the shoreline, seagrass beds extend across the mudflat below mean water level, and at spring low the intertidal flat runs several hundred metres out from the mangrove edge. The eastern coast faces the open Indian Ocean: an exposed dune beach, no reef protection, full swell exposure from the southeast. The same 3.5 m spring range applies to both sides, but the two coasts read entirely differently because the bottom type, slope, and energy regime differ so completely. Tides here are semidiurnal, with spring range approximately 3.5 m and neap range around 1.7 m.

The seagrass beds on the western intertidal flat are among the most important in southern Mozambique. Green turtles (Chelonia mydas) feed in the seagrass from late afternoon through the morning before retreating to deeper water as the flat shallows toward low water. At high water the flat holds 1.5 to 2.5 m over the seagrass, and turtles can be observed from the shore or from a kayak by anyone willing to move slowly and stay low. Dugong (Dugong dugon) are recorded in the bay's seagrass system, though sightings require patience and local knowledge of the feeding areas. The western intertidal flat at Inhaca is one of the few remaining east African sites where a single visit can produce all three — turtles, dugong, and flamingo — if timed to the flood and the right season.

The bird life on the intertidal flat at low spring is substantial. Crab plovers (Dromas ardeola) and a range of migratory waders use the exposed mudflat from October through March. Greater flamingos (Phoenicopterus roseus) work the shallow edges in small groups. The mangrove on the western coast holds herons, kingfishers, and the mangrove kingfisher (Halcyon senegaloides). The low spring tide, arriving around dawn or dusk (depending on the phase of the semidiurnal cycle), produces the most dramatic intertidal exposure for bird observation. Walking the exposed flat at low spring requires tracking the flood return: the water rises at approximately 0.4 m per hour on springs, and the wide flat can cover quickly.

Whale sharks (Rhincodon typus) aggregate seasonally in Delagoa Bay, concentrated by the same upwelling and plankton dynamics that bring them to the Inhambane coast. The Eduardo Mondlane research station has published seasonal encounter data; peak months in Delagoa Bay run from October through February, with sightings predominantly in the deeper outer bay channels. The research station at the island is not a public visitor facility, but the presence of a long-running field programme means local guides and boat operators are more knowledgeable about seasonal marine patterns here than at most comparable sites on the Mozambican coast.

The ferry crossing from Maputo to Inhaca runs twice daily on the Vodacom Ferry schedule — departure times are set on the tidal cycle, as the channel approaches at the Maputo waterfront and at the Inhaca landing are both shallow on the ebb. Check the day's schedule against the ferry operator's confirmed departure time rather than assuming a fixed time. Missing the ferry means an overnight stay; plan accordingly if making a day trip.

Predictions for Inhaca Island 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. The authoritative Mozambican tide tables are published by Instituto Nacional de Hidrografia e Navegação (INAHINA). These predictions are not for navigation.