Bhutanese women in traditional clothes are turning the prayer-wheel at the Punakha Dzong, Punakha, Bhutan. Punakha Dzong is the administrative centre of Punakha District. It was was built in 1637-38 by Ngawang Namgyal, 1st Zabdrung Rimpoche. The Dzong is located at the confluence of the Pho Chhu and Mo Chhu riversand it is the second oldest and second largest dzong in Bhutan.