Punakha Dzong is situated in Punakha which was built by Ngawang Namgyal in 1637–38. Punakha is at just 3 hours journey from Thimphu, the capital of Bhutan. The Dzong is located between the Pho Chhu (Male) and Mo Chhu (Female) river in the Punakha–valley. The source of the Mo chu river is in the northern hills of Lighsi and Laya in Bhutan, and in Tibet. After the confluence of these two rivers, the main river is known as Puna Tsang chu or Sankosh River and flows down through Wangdue Phodrang, crosses the Bhutan–India border at Kalikhola and eventually meets the Brahmaputra River. As Punakha Dzong is located at only 1,200 meters, you will not suffer from oxygen shortages as you would in higher places such as Paro Taktsang (Tiger's Nest), so it is a good place for beginner hiker to start from, as you may struggle with altitude sickness in the first few days.