The large fjord of Arnarfjörður, which lies between the villages of Bíldudalur and Þingeyri, is entirely a nature reserve. the magnificent fjord ends in four small offshoot fjords: Geirþjófsfjörður (north), Fossfjörður and Reykjafjörður (south), and Trostansfjörður in the middle. Thickly vegetated with rowan and birch, Trostansfjörður is a very isolated and peaceful place to explore, and the derelict remains of a farm provide added interest. The fjord is thought to be named after Saint Drostan from Scotland.