The two dzongkhags (administrative districts) of Zhemgang and Sarpang lie on the southern border of central Bhutan. This region is open to tourism and Gelephu town is connected to Paro by regular flights, yet it remains little visited. Gelephu also offers a remote alternative entry or exit route between Bhutan and Assam in India. The region around Zhemgang was once a collection of tiny principalities, collectively known as Khyeng, absorbed into Bhutan in the 17th century.
For tourists the highlights include superb birdwatching, spotting golden langurs right beside the road, and Royal Manas National Park, which offers wildlife enthusiasts an amazing opportunity to explore an area of unsurpassed biodiversity.