How does Arunachal Pradesh's mountainous terrain affect transportation?

The rugged, mountainous terrain of Arunachal Pradesh creates significant challenges for transportation and communication infrastructure. The state's landscape is defined by deep valleys and high ridges that rise from the foothills to the peaks of the Great Himalayas, making the construction and maintenance of paved roads difficult.12

Historically, these geographic barriers have limited the state's connectivity with the rest of India, leaving many regions reliant on traditional footpaths to link villages at varying elevations. While major transportation hubs—including airports and railheads—are primarily located in the neighboring state of Assam, infrastructure has gradually improved. Recent developments include the opening of a rail line to Naharlagun in 2014, the operation of a greenfield airport at Itanagar, and the expansion of mobile telephone services and fiber-optic internet into remote mountain areas. Despite these advancements, the challenging topography remains a primary factor in the state's limited transportation network.1