| Category | Oceanic |
| Location | Buccaneer Archipelago |
| Map | Baradyan |
The mighty Tildon Deep is a vast undersea chasm located within the Sea of Mourning. In the northeastern region of this area lies the caldera of an ancient, dormant volcano, measuring one mile wide and plunging nearly three miles in depth. This geological feature proves fortunate for the sahuagin and other aquatic denizens inhabiting the city of T'kyr, which has been established at the very base of this ancient volcanic structure.
The surface above the chasm serves as a crucial sea route for vessels bearing diverse flags. The malevolent denizens of Tildon Deep pose a frequent menace to the passing ships.