[4] The proposed 2,000-kilometre-long (1,200 mi) Arunachal Pradesh Frontier Highway goes along the McMahon Line,[5][6][7][8] and will pass through the Lower Dibang Valley district.

[10] According to the 2011 census, the Lower Dibang Valley district has a population of 54,080,[1] roughly equal to the island nation of Saint Kitts and Nevis.

At the time of the 2011 census, 24.29% of the population spoke Nepali, 23.03% Adi, 15.15% Mishmi, 7.04% Bengali, 7.02% Mishing, 4.54% Bhojpuri, 3.75% Assamese, 2.83% Hindi and 2.23% Galo as their first language.

Rare mammals such as Mishmi takin, red goral, elephants, wild water buffalos and leaf muntjac live in the district.

Birds that live in the Lower Dibang Valley include Sclater's monal, Blyth's tragopan, the rufous-necked hornbill, the Bengal florican, and the white-winged wood duck.

[15] In 1980, the Lower Dibang Valley district became home to the Mehao Wildlife Sanctuary, which has an area of 282 km2 (108.9 sq mi).