This island was shown to have a hill and a small lake on the Dragons: Race to the Edge Interactive Map, but it lacks those features on the map's movie version.
As noted by Hiccup, there is a small village inhabiting this island.
An image of an unnamed island appears in a subsection discussing water for survival when scouting and camping. Though no name is mentioned, it matches the shape of Sunken City on Hiccup's map. There are also two areas labeled as "people" and "sheep", indicating a small village on the island.
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