(Art Credit: Baldur's Gate 3)

The Underdark is a enormous system of subterranean caves, caverns, and tunnels located beneath the surface of Abmarah. While some even go as far as to consider it a separate plane, it is undeniably a part of Abmarah's ecosystem despite being extremely deep underground. It's said that the Underdark truly begins two kilometers below sea level, and there are many entrances to it via the various caves, trenches, and dwarven cities across Abmarah. Vertically, the Underdark is further divided into three zones, being:

• The Upperdark, said to be the safest zone ranging from around 2 km to 5 km deep. Most surface travelers rarely venture deeper than this relatively 'safest' layer.

• The Middledark, which includes most of the Underdark from around 5 km to 10 km deep. Most underground cities exist in this layer.

• The Lowerdark, a terrible pit of darkness and danger deeper than 10 km below the surface. Even Underdark residents rarely travel this far deep.

The Underdark exists mostly under Aurial and Eqos. Eteru used to have a much more expansive underdark system, but it collapsed in during the Omniborn Crisis and became the Alfuin Badlands exposed to the surface. The Underdark also contains a vast underground ocean called Noxila Ocean, often said to be the fifth ocean of Abmarah. The Underdark is not one giant cavern under Abmarah, but rather many huge networks of caverns and caves. As a result, it is not always possible to travel from one end of the Underdark to the other. It also contained many large underground seas, rivers, and lakes. Very few nations exist in the Underdark, and it is mostly populated by free cities. However, the Kingdom of Nûzabad and the Crimson Empire do hold some territorial claim on a few of these underground cities.

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