The Colossal Depths is a vast sea area that occupies the northern coast of Frostfire Ridge and northwestern Gorgrond. It merges into the Barrier Sea to the northeast, and Frostbite Deep is located to its southwest. Deepwater Giants (in Frostfire Ridge) and Deepwater Shamblers (in Gorgrond) can be found roaming the bottom of the depths.
- A small group of level 100 rock flayers, Frost Flayers and Frost Flayer Hatchlings, can be found on a small island which currently serve no purpose or drop any loot.
- Patch 6.0.2 (2014-10-14): Added.