Thunderclaw Island

Thunderclaw Island is a location searchable by Toothless in the game, Dragons: Rise of Berk.

Geography
There is an image that appears on Hiccup's Race to the Edge Map. However, it is rather nondescript - brown with no indication of contour or vegetation.

Other Appearances
Thunderclaw Island does appear on the Interactive Map on the Dragons: Race To the Edge website. The island thus far is not featured in this TV series, however.