Straits of Baldur

The Straits of Baldur are a water route in the vicinity of Berk and Outcast Island.

Dire Straits
Having had his operations disrupted by Hiccup yet again, Viggo Grimborn decides to strike back. To that end, he somehow manages to trap a Submaripper in the Straits of Baldur, preventing any trade ships from reaching Berk. Fortunately, Hiccup succeeded in freeing the Submaripper, allowing ships to reach Berk unharmed.

Shell Shocked, Part 1
The Dragon Riders later assembled in the Straits of Baldur anticipating that Ryker Grimborn would attack Outcast Island, only for him to strike at Berserker Island instead.