Tanzania's water experiences span the East African coast, the Indian Ocean islands, and three of Africa's Great Lakes. Zanzibar dhow sunset cruises — traditional wooden sailing vessels navigating the channel between the island and the mainland at the hour when the light turns everything gold — are the most atmospheric coastal experience. Kilwa Kisiwani historical island boat tours to the Swahili sultanate ruins, whale shark snorkelling tours from Mafia Island (the best concentration in East Africa), and sea kayaking through the Quirimbas Archipelago add the coastal wildlife register. Lake Victoria fishing boat cultural experiences from Mwanza, Lake Tanganyika boat excursions to the Gombe Stream chimpanzee reserve, and the Rufiji River launch safari through the Selous complete a water geography of extraordinary variety.