The Sullen Sea is a sea located in the Barbaric Archipelago.
|“||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.
The Sullen Sea first appears on a map of the Inner Isles at the front of Book 3.
In Book 4 it is winter. It is the "worst winter for 100 years" and the Sullen Sea has frozen over. While frozen, the Vikings take advantage of travel by sleigh instead of boat. It is in the Sullen Sea that the Doomfang catches up to a fleeing Hiccup and snatches the mythical potato from him.
Sullen Sea on the Map of the Official How to Train Your Dragon Books Website.
|The Barbaric Archipelago of|