Sessa Orchid Sanctuary - Geography & Climate

Geography & Climate

Sessa and Eaglenest together occupy a rough east-west rectangle with Sessa occupying the north-east quadrant. The Bhalukpong-Bomdila highway (and Pakke immediately beyond) are its eastern boundary. It is bounded to the north by the Tenga River valley. Altitude is 900 metres (2,953 ft) to 3,250 metres (10,663 ft).

Sessa and Eaglenest ridges rise to 3,250 metres (10,663 ft) and 2,700 metres (8,858 ft) respectively and are the first major barriers to the monsoon as it moves north from the plains of Assam. These ridges get over 3,000 millimetres (120 in) of rain on the southern slopes and about 1,500 millimetres (59 in) on the northern slopes.

Sessa sanctuary is drained by the Tippi Naala (Tippi river) which joins the Kameng river at Tippi village on the Bhalukpong-Bomdila highway. Topographic map

Sessa is part of the Kameng protected area complex (KPAC), the largest contiguous closed-canopy forest tract of Arunachal Pradesh, which includes Sessa, Eaglenest, Pakke, Nameri, and Sonai Rupai sanctuaries and associated reserved forest blocks. The Complex covers 3500 km2 in area and ranges from 100 metres (328 ft) to 3,300 metres (10,827 ft)3300m in altitude.

Sessa is in an area under claim of Chinese sovereignty, in the jurisdiction of Cuona County of Shannan Prefecture of the Tibet Autonomous Region.

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