The trip from Bumthang to Mongar crosses over the 4,000 m high Thrumsing-la pass and is vividly spectacular from just about any perspective as you will find out when you go on the trip. Mongar marks the beginning of eastern Bhutan. Mongar is the second largest town in the subtropical east. It is built high on a gently sloping hillside.
Although Mongar Dzong was built in the 1930s and is one of Bhutan's newest dzongs, it is constructed in the same fashion as all earlier dzongs without wooden planks or iron nails. A visit to Mongar Dzong demonstrates how traditional Bhutanese architecture has continued to thrive through the centuries.
Tashiyangtse is a rapidly growing town and an administrative hub for the entire district. Tashiyangtse is located in a small river valley. It is a lovely spot from which to take walks in the surrounding countryside. The dzong overlooking the town was built in the late 1990s when the new district was created. Tashiyangtse is famous for its wooden containers and bowls, which you can purchase as mementos during your visit to this rather remote region. They are extremely well-crafted and very inexpensive. While you are there, be sure to visit the Institute for Zorig Chusum, where students study the 13 traditional arts and crafts of Bhutan.
Chorten Kora is a must-see dazzling white stupa situated on the river bank below the town of Tashiyangtse. It is a rapidly growing town and an administrative hub for the entire district. Tashiyangtse is located in a narrow river valley. It is a lovely spot from which to take long walks in the vicinity. Constructed in 1740 AD by Lama Ngawang Loday, it is built in the same tradition as Bodnath Stupa in Nepal, with eyes painted at the four cardinal points. During the second month of the lunar calendar there is an interesting celebration here known as the "Kora."
Bomdeling is a pleasant three-hour walk from Chorten Kora. It is an annual destination for winter migration for black necked cranes which arrive from nearby Tibet in the north to pass the winter months in a relatively warmer climate. If you are able to time your trip to this area in sync with the migration, you are in for not just a bunch of sights but a bundle of experiences. Watch the cranes frolicking in their natural habitat and feeding their young ones as they wait for spring to arrive.