(literally "mountaintop fjord") is a fjord that flows from the southeastern side of Faxaflói (Faxi Bay). It spans from Kjalarnes peninsula at the mouth of Hvalfjörður all the way to Seltjarnarnes, with Skerjafjörður just to the south.
Geography There are several large islands in (Akurey, Engey, Viðey, Þerney, and Lundey), most of which were inhabited at various points. On the northern side of the fjord is Kjalarnes peninsula and the mountain Esja. On the eastern side are the mountains Mosfell and Reykjafell, as well as the municipality of Mosfellsbær, and Leirvogur bay. On the southern side of the fjord are Elliðavogur, Reykjavík, and Seltjarnarnes.
There are three municipalities with land bordering : Reykjavík, Mosfellsbær, and Seltjarnarnes.
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