Hello!
This note seems misplaced. There aren't any cliffs here. It is located in the ocean, over 5 km from the coast of Þorlákshöfn and about 70 km away from Hafnir (https://www.openstreetmap.org/node/372918152).
I'm thus closing this note. Please feel free to reopen (or open a note at the correct place) and provide more details about what is wrong or missing on OpenStreetMap.