Okay so maybe I'm looking way too into this, but I think I know where Hiccup and Toothless are in this scene, or what the animators of this location were possibly inspired by;
There is a Scottish Island named 'Staffa' (meaning 'Pillar Island' in Old Norse language) which has the same rock formations (see below):
These rocks are the result a volcanic eruption, with basalt/lava cooling and solidifying into these 'pillars' which are also on the coast of Ireland at the 'Giant's Causeway' as seen here:
There is actually a Myth surrounding these two areas and how the rocks were formed~
The legend goes that an Irish giant had a rivalry with a Scottish giant. The Irish giant decided to build this causeway from Ireland to Scotland so that he could challenge his rival to a battle. The Scottish giant used to causeway of pillared rocks to walk to Ireland, and the Irish giant, realizing that his rival was much bigger than he was, ran home to his wife for advice. His wife cleverly disguised her husband as a baby, making the Scottish giant believe that the Irish giants offspring was really that big. Scared by this, the Scottish giant thought that if the baby was that big, the father would be huge, and so he fled back to Staffa.
I've actually been to the Giant's Causeway and for whatever reason I never noticed this until now... I just thought this might have been interesting!
