- Floahad, a spur in Northwest
- Floguas, a hill in Northeast
- Floguhnjukur, a peak in East
- Fossarvotn, a lake in East
- Fossbrekkur, a slope in East
- Fossdalur, a valley in Northeast
- Fossvellir in East
- Fremra-Deildarvatn, a lake in Northeast
- Fremrafjallshlid, a slope in Northeast
- Fremri-Hamar in East
- Fremri-Hlid in East
- Fremri-Hvitardalur, a valley in Northwest
- Fremri-Kot in Northwest
- Fremridalur, a valley in Northeast
- Fuglanes, a peninsula in East
- Furuvik, a cove in Northeast
- Fyrirbard in Northwest
- Klappara, a stream in East
- Klapparashnjukur, a peak in East
- Klapparlakjarfloi, a bog in East
- Klapparlakur, a stream in East
- Klapparos, a stream mouth in Northeast
- Klauf, a hill in Northeast
- Klaufabrekknadalur, a valley in Northeast
- Klaufargerdi in Northeast
- Klaufarkvisl, a bog in South
- Kleifarmuli, a spur in East
- Krossa, a stream in Westfjords
- Sletta in East
- Slettidalur, a valley in East
- Slettuheidi, a heath in Northeast
- Slettuhlidarvatn, a lake in Northwest
- Slottur, a peak in East
- Sly, a bog in Northeast
- Smagil, a gorge in East
- Smaholagil, a gorge in East
- Smaholatindur, a peak in East
- Smatindar, a peak in East
- Smellur, a rock in East
- Smidjunes in East
- Smidsgerdi in Northwest
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- Smjorbitlar, a hill in Northeast
- Smjorfjallaskard, a pass in East
- Smjorhnuta, a peak in East
- Smjorkollar, a hill in East
- Smjorvatnsheidi, a heath in East
- Smjorvotn, a lake in East
- Smyrlafell, a hill in Northeast
- Snadalur, a valley in East
- Snahvammstindur, a peak in East
- Snahvammur in East
- Snartarstadanupur, a headland in Northeast
- Sneis in Northwest
- Snjoholt in East
- Snjotindur, a peak in East
- Snotrunes in East
- Sodulhnjukur, a peak in East
- Soleyjartindur, a peak in East
- Soleyjarvellir in Northeast
- Solheimafjall, a hill in Northeast
- Solheimar in Northwest
- Somastadatindur, a peak in East
- Sorlastadir in East
- Spanardalur, a valley in Northwest
- Spanarhraun, a gorge in East
- Stadaras, a hill in Northeast
- Stadarfjall, a hill in East
- Stadarsel in Northeast
- Stafn in Northeast
- Stafnsvotn, a lake in Northwest
- Stafsholl in Northwest
- Stakfellsvatn, a lake in Northeast
- Stakihjalli in East
- Stakkahlid in East
- Stakkar, a rock in Northeast
- Stangararhnaus, a slope in East
- Stapaa, a stream in East
- Stapavik, a cove in East
- Stapi in Northwest
- Starmyrartangi, a spit in East
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