The Central Marshes stretched between Nasiriyah, Al-'Uzair (Ezra's Tomb) and Al-Qurnah and were mainly fed by the Tigris and its distributaries (the Shatt al-Muminah and Majar al-Kabir).

The Central Marshes were characterised by tall qasab reeds but included a number of freshwater lakes, of which the largest were the Haur az-Zikri and Umm al-Binni (literally "mother of binni", the latter being a species of barbel.

)[2] The marshes support breeding populations of the Basra reed-warbler and marbled teal, along with several other species of non-breeding birds.

[7] In the early 1990s, the government of Iraq undertook a series of major drainage projects, at least partly in retribution for the events of the 1991 uprisings, and to prevent the area being used as a refuge by militias.

The flow southwards from the distributary streams of the Tigris was blocked by large embankments and discharged into the Al-Amarah or Glory Canal, resulting in the loss of two-thirds of the Central Marshes by as early as 1993.