Tartarus (Western Noah) is a location in Monster Girl Quest Paradox and is located inside Esta on a giant lake.
Overview
This place is currently inaccessible due to the water being blocked by Tartarus and a boat would make it crash to the bottom. Investigators from Grand Noah haven't fully investigated the area. While Luka and his friends investigated the entrance of the Tartarus, On Ilias route, Zion appeared while on Alice route Gnosis appeared from inside the Tartarus. They were warned that investigating the Tartarus posed a danger on them as trespassing and began to attack Luka's party until he tells them that he saw a vision created from Esta inside the Tartarus and was orchestrated by Raphaela.
Map of the Area
Partial View of Western Noah Tartarus in Esta