The marsh is situated in the westernmost reaches of the Sofia Valley, 5 km north-west of the town of Slivnitsa and 1 km north of the village of Aldomirovtsi near European route E80.
Aldomirovtsi marsh is home to many nesting and wintering bird species, including ruff, great crested grebe, little grebe, black-necked grebe, white stork, water rail, little gull, common redshank, little egret, little bittern, short-toed snake eagle, etc.