Thorstopia

Thorstopia is a location available for Journey (similar to a Pick-Your-Own Adventure) to the Twins in the game, Dragons: Rise of Berk.

Official Description
"RUFF: "That? It's nothing more than a rock for those Razorwhips." TUFF: "You mean a rock for our new subjects." RUFF: "Its still just a rock." TUFF: "Where you see a rock, I see freedom! I see Thorstopia!""

- Dragons: Rise of Berk

Geography
According to the Journey logs, Thorstopia is a huge rock located off the coast of Dragon's Edge (Outpost Island). It is large enough to support a number of landed Razorwhips. Dragons: Rise of Berk does not indicate Thorstopia is a Sea Stack, however.

Dragons: Rise of Berk
Thorstopia appears as a Journey activity for Ruffnut and Tuffnut, once Barf and Belch reach Level 90. In addition to Runes, Iron, and Collection items, the play may find eggs of a Threadtail, Windgnasher, or a Thorstopian - a Razorwhip who lives on Thorstopia.