Location: 45°38'13.48"N, 22°36'36.82"E
Lunca Cernii de Jos commune is made up of seven villages, namely: Lunca Cernii de Jos village of residence, Lunca Cernii de Sus, Meria, Fântâna, Gura Bordului, Negoi and Valea Babii. The perimeter of these villages is located in the southwestern part of Hunedoara County, at a distance of 70 km from Deva, the county seat, and 46 km from Hunedoara, the nearest town.
Lunca Cernii de Jos commune stretches over the branches of the Poiana Ruscăi Mountains, along the Cerna River. The relief of the commune is mountainous, strongly kneaded, represented by gentle and steep summits at an altitude of about 850 m.
Lunca Cernii de Jos commune is located in the eastern part of Topliţa commune and Răchitova commune, in the south with Densuş commune and Caraş-Severin county, in the west with Caraş-Severin County and Timiş County, and in the north with Bunila commune.
Facing Lunca Cernii de Jos residence of the commune, the villages are located at distances between 3 Km. (Lunca de Cernii de Sus) and 9 Km. (Fântâna).