Hibernaculum as seen in the TV Series

Hibernaculum is a location where the Silverwing bats migrate to for the winter.

In both the Silverwing Book and the TV Series, Shade and Marina end up meeting the Silverwing colony there.

This is where Goth and Throbb planned to travel to with Shade and Marina and devour the entire colony over the course of the winter while they were in hibernation.