The city occupies an area of over 3,527 km2. Karachi is mostly made up of flat or rolling plains with hills on the western and northern boundaries of the urban sprawl. Two rivers pass through the city: the Malir River (north east to centre) and the Lyari River (north to south). Many other smaller rivers pass through the city as well with general drainage being from the western and northern areas towards the south. The Karachi Harbour is a protected bay to the south west of the city. The harbour is protected from storms by Keamari Island, Manora Island and Oyster Rocks, which together block the greater part of the harbour entrance in the west. The southern limit of the city is the Arabian Sea and forms a chain of warm water beaches that are rich in natural beauty.
