Scott and Seringapatam Reefs is a group of atoll-like reefs in the Timor Sea more than northwest of Cape Leveque, Western Australia, on the edge of the continental shelf. There are three or four separate reef structures, depending on whether Scott Reef Central is counted separately. The group is just one of a number of reef formations off the northwest coast of Australia and belongs to Western Australia. Further to the northeast are Ashmore and Cartier Islands, and to the southwest are the Rowley Shoals. Location and Description Each of the reefs rises steeply from the seabed below. Much of the reef area dries at low tide, but besides Sandy Islet of Scott Reef South, there are only a few rocks and sandbanks above the high water mark. Scott Reef South (also Horseshoe Reef or South Reef) is a large crescent-shaped formation that has a rare and unusual double reef crest. Its lagoon, has depths of over throughout the greater portion. The reef with its lagoon covers an area of . Scott Reef Central, because of its proximity occasionally subsumed within Scott Reef South, lies off West Hook (the western extremity of the crescent of Scott Reef South), with Sandy Islet at ( north-south, up to wide, with an area of ). This reef falls dry to the extent of from the islet. There is a conspicuous tower on the islet and also a boulder with a height 2.4 m near its northern end. A detached reef, which dries , lies northeast of Sandy Islet. The passage between Scott Reef South and Scott Reef Central is only deep, much less than the passages between the other reefs ( between Scott Reef South and Scott Reef North). Scott Reef North consists of a large, approximately circular-shaped, reef lying southwest of Seringapatam Reef. The reef is composed of a narrow reef-crest that is backed by broad reef flats – much of which becomes exposed at low tide – and a deep central lagoon that is connected to the open sea by two delta-like channels. The reef with its lagoon covers an area of . Seringapatam Reef is located at , north of Scott Reef North. It is an egg-shaped reef, with a total area of approximately , which is about evenly divided between lagoon and reef flat. Its narrow reef rim encloses a relatively deep lagoon. Much of the reef becomes exposed