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Breiðafjörður (Icelandic: [ˈpreiːðaˌfjœrðʏr̥] ⓘ, lit. wide fjord) is a large shallow bay, about 50 km (31 mi) wide and 125 km (78 mi) long, in the west of Iceland. It separates the region of the Westfjords (Vestfirðir) from the Snæfellsnes peninsula to the south. Breiðafjörður is encircled by mountains, including Kirkjufell and the glacier Snæfellsjökull on the Snæfellsnes peninsula, and the Látrabjarg bird cliffs at the tip of the Westfjords. Numerous smaller fjords extend inland from Breiðafjörður, the largest being Hvammsfjörður at its southeastern corner. An interesting feature of the bay is that the land to the north was formed about 15 million years ago, whereas the land to the south was formed less than half that time ago.[clarification needed]
Breiðafjörður has a spectacular land and seascape consisting of shallow seas, small fjords and bays, and intertidal areas, dotted with about 3,000 islands, islets and skerries. The area contains about half of Iceland's intertidal area and tides can be 6 m (20 ft). The bedrock was formed during rift volcanism in the late Tertiary period. The area consists mainly of basaltic lava that was deeply eroded by glaciers during the quaternary age, creating a diverse landscape. There are several geothermal sites, some visible only at low tide.
The big intertidal zone is high in biodiversity and productivity and has extensive algal forests and other important habitats for fish and invertebrates. The area supports 230 species of vascular plants and around 50 breeding bird species including the common shag, glaucous gull, white-tailed eagle, common eider, black guillemot and grey phalarope. The area is an important staging area for brent goose and red knot. The common seal and the grey seal have their main haul-out on the islands and skerries.
Several species of cetaceans are commonly found including the common porpoise, white-beaked dolphin, killer whale and minke whale.
The islands in Breiðafjörður have an unbroken history of human use, but now only Flatey is inhabited year-round. Many islands are used for summer residences and for harvesting of natural resources such as eiderdown. Some of the islands include:
Fisheries, tourism and algal harvesting are other major uses of the area. South of Reykhólar, on a small island offshore, Norður &Co. manufactures sea salt obtained by evaporation of seawater using geothermal energy. The process was first used in this region in 1753 and was chosen by Soren Røsenkilde when he established Norður in 2012.
Breiðafjörður is the spawning ground for some of Iceland's most important economic fish species.
From the small port of Stykkishólmur on the Snæfellsnes peninsula, a ferry crosses Breiðafjörður to Brjánslækur in the Westfjords, stopping at the island of Flatey on the way. It is also possible to circle around Breiðafjörður overland, by car. If the weather is fine, it is possible to see the coastline of the Westfjords from the Snæfellsnes peninsula, at a distance of up to 40 km (25 mi).
During the Middle Ages, especially in the 12th century, there was a monasteryofAugustine monks on the island of Flatey which formed an important centre of Icelandic culture. The most extensive medieval manuscript, the Flateyjarbók was written there. Afterwards, the island was an important trading post and also home to a printing press.
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65°15′N 23°15′W / 65.250°N 23.250°W / 65.250; -23.250
