Suva located in/on physical feature Viti Levu
Geography and physical characteristics
Suva is not only the capital of Fiji, but also its commercial and political centre (though not necessarily its cultural centre), and its main port city. It has a mix of modern buildings and colonial-period architecture. 
Suva is located around a harbour on a hilly peninsula in the southeast corner of Viti Levu Island, between Laucala Bay and Suva Harbour. The mountains to its north and west catch the southeast trade winds, producing year-round moist conditions.
Although Suva is on a peninsula, and almost surrounded by sea, its coast is lined with mangroves- the nearest beach is 40 kilometres (25 mi) away, at Pacific Harbour. A significant part of the city centre, including the Parliament buildings, is built on reclaimed mangrove swampland.
situated in/on physical feature positioned in/on physical feature found in/on physical feature placed in/on physical feature situated on/at physical feature