It has 195 km (121 mi) of coastline on the Persian Gulf and includes nine islands, the largest being Bubiyan Island. The main geographical feature is the large Kuwait Bay, which provides a natural harbour and on the shores of which Kuwait City is located.[1] The country has no mountains, rivers or lakes, but consists largely of undulating flat land with some low hills. It is divided into four zones; a desert plateau to the west; salt marshes, mud flats and saline depressions around Kuwait Bay; sand dunes to the east; and a desert plain occupying the bulk of the country.[2]