Merak is one of the remotest geogs under the Merak-Sakteng Drungkhag in Trashigang Dzongkhag and it has an area of 867.7 Km2. It is located in the eastern part of the Dzongkhag and shares a boundary with Shongphu geowg in the west, Sakteng geog in the north, Kangpara geog in the south and the Indian state of Arunachal Pradesh in the east. Merak lies in the valley of Nyera Ama Ri and the altitude is about 3400-3500m above sea level. Nyakchung La, which is about 4100m and above is the pass between Merak and Sakteng geogs and it stretches from latitude 270 17.84� to 270 18.51�N and from longitude 910 50.76� to 910 52.12�E.( report on soils of Merak Sakteng, 1999).