A relatively narrow river mouth emptying water from the Athi-Galana-Sabaki River originating over 400kms away near Nairobi, Sabaki is legendary among east African birders for the number of rarities that turn up there such as frigatebirds, boobies, skuas, vagrant waders and terns. At low tide, huge areas of mud flats are exposed as well as sand banks nearer the sea, the former a feeding ground attracting many thousands of waders, the latter providing excellent roost sites for gulls and terns. Being less saline, the estuary attracts species not commonly found elsewhere on the coastline such as Marsh Sandpiper and Wood Sandpiper, with whistling duck, cormorants, African Spoonbill, Water Thick-knee, and Spur-winged Plover found just up stream of the mouth itself. It also holds Kenya's only established wintering population of Broad-billed Sandpipers and is the best site to find Madagascar Pratincole (sometimes numbering into the thousands) between the months of May-September and White-fronted Sandplovers. In 1998 and 1999 2-3,000 Lesser Flamingos were resident here, a species which previously was absent from the coastal region, and since then it has not been unusual to see up to a few hundred on the mud flats. A few kilometres to the north of the river near Gongoni is a breeding site for the Malindi Pipit, another species with a restricted range and that is hard to find elsewhere (and unlike most birders seem to think, is not found regularly at the river mouth).