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The northern half of the Northern Mozambique Channel (NMC) extends northwards from the narrowest part of the channel between Madagascar and Mozambique, at about 17°S (Fig. 4.1). The Aldabra group of islands lies just to the north, at about 9°S, but the precise northern limit is not clear and is operationally set to include Mafia Island in central Tanzania at about 7°S. It is bounded by northwest Madagascar, northern Mozambique, and southern Tanzania, with the Comoro archipelago at its heart.