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      The Sullen Sea is a sea located in the Barbaric Archipelago.

Official Description

"The Sullen Sea is frozen over in the cold winter and strange noises can be heard if the ice starts to crack. Doomfangs can also be found in the Sullen Sea."
―Official How to Train Your Dragon Books Website


The Sullen Sea is located around the inner isles of the Barbaric Archipelago. Adjacent from the north is Bashem, and adjacent from the east is the Summer Current. To the south lies Mount Villainy, and to the west lies Silence. To the southwest is the Bog-Burglar Islands.


How to Speak Dragonese

The Sullen Sea first appears on a map of the Inner Isles at the front of Book 3.

How to Cheat a Dragon's Curse

In Book 4 it is winter. It is the "worst winter for 100 years" and the Sullen Sea has frozen over.



Icon-WebsiteMap Sullen Sea on the Map of the Official How to Train Your Dragon Books Website.

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