Nordland has a rugged coastline, with many fjords. From south to north, the main fjords are Bindalsfjord, Vefsnfjord, Ranfjord, Saltfjord-Skjerstadfjord, Folda, Tysfjord, Ofotfjord (the longest) and Andfjord, which is shared with Troms county. The best-known is perhaps the Vestfjorden, which is not really a fjord, but an open stretch of sea between the Lofoten island group and the mainland. The Raftsundet strait, with its famous branch Trollfjord, is the shortest waterway connecting Lofoten and Vesterålen. The continental shelf is very narrow west of Andenes, nowhere else in Norway is the deep ocean only a few kilometres from shore. Saltstraumen whirlpool is just southeast of Bodø, and Moskenstraumen is located in southern Lofoten.