Eaglenest and Sessa ridges rise to and respectively and are the first major barriers to the monsoon as it moves north from the plains of Assam.
Eaglenest is part of the Kameng protected area complex (KPAC), the largest contiguous closed-canopy forest tract of Arunachal Pradesh, which includes Eaglenest, Pakke, Sessa, Nameri, and Sonai Rupai sanctuaries and associated reserved forest blocks.