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Peters then recruited specialists who began exploring south to the Rufiji River and north to Witu, near Lamu on the coast.
Interesting places in the park include the Rufiji River, which flows into the Indian Ocean opposite Mafia Island and the Stiegler Gorge, a canyon of 100 metres depth and 100 metres width.
Matuumbi, also known as Kimatumbi, is a language spoken in Tanzania in the Kipatimu region of the Kilwa District, south of the Rufiji river.
In recent years, professor Felix Chami has found archaeological evidence for extensive Roman trade on Mafia Island and, not far away, on the mainland, near the mouth of the Rufiji River, which he dated to the first few centuries CE.