This island was shown to have a hill and a small lake on Hiccup's online Race to The Edge map, but it lacks those features on the map's movie version.
As noted by Hiccup, there is a small village inhabitating 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 in "rune" script, but does not appear to be actual words.
Sunken City 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.
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