Black Marsh is a dense swampland region of southeastern Tamriel, home to the reptilian humanoid race of Argonians and a race of sentient trees known as the Hist. Mer races also use the name Argonia, a reference to an obscure ancient battlefield, to avoid the negative connotations of the term “Black Marsh.”
Argonians thrive in the foreboding swamps of Black Marsh, a lush and threatening land teeming with poisonous plants and violent predators. The region’s tropical climate lends its plants the capacity to overturn all attempts to cultivate them. Foreign agricultural, colonial, and commercial ventures beyond the slave-trade have met with abject failure. The native Argonians organize themselves on the tribal level with success and efficiency, and are only loosely integrated into the ruling Empire.