The valleys of Bhutan are linked by a series of passes (“La” in Dzongkha). Between the Haa valley and Paro Valley is the Chele La (3,780 metres (12,402 ft)). From Thimphu to Punakha crosses the Dochu La (3,116 metres (10,223 ft)), which features 108 chortens built to commemorate the expulsion of Assamese guerrillas. East of Wangduephodrang is Pele La (3,390 metres (11,122 ft)). Continuing towards east along the main highway, other major passes include Yotong La, Shertang La, Wangthang La, Thrumshing La and Kori La (2,298 metres (7,539 ft))
Thrumshing La separates Bumthang and Lhuentse Districts and forms the watershed between Raidāk and Manas River systems.
It is the second-highest mountain pass in Bhutan, connecting its central and eastern regions. It is located on a bend of Lateral Road at the border of Bumthang District (Ura Gewog, leaving Ura southbound) and Mongar District (Saling Gewog, toward Sengor) along the border with Lhuntse District to the east.
Dochula pass is located on the way to Punakha and Wangduephodrang districts from Thimphu. This pass is popular tourists spot due to its ideal location from where one can enjoy 360 degree of beautiful panoramic view of Himalayan mountain range, especially on clear winter days. The beauty/attraction of this place is further enhanced by Druk Wangyal Chortens-108 stupa built by the eldest Queen Mother Her Majesty Ashi Dorji Wangmo Wangchuk to commemorate the expulsion of Assamese guerrillas.
Chele la top 3810m height, separates Haa and Paro valley. It is one of the highest motor-able pass in Bhutan. Drive to the pass is through dense spruce and larch forests along the gorgreous mountain slope. On a clear day you can see the spectacular views of Mt. Jomolhari, Jichu Drake and adjoining Peaks to the North West, as well as splendid view of Paro and Haa valley.
Pele la pass (3420m), is marked by a chorten and an array of prayer flags. On a clear day (which is rare in these parts) mount Jhomolhari (7314m)& Jichu Drakye (6989m) are visible. Pele La pass marks the western border of Jigme Singye Wangchuck (formerly the Black Mountains) National Park and is the gateway to central Bhutan.
Yotongla Pass at 11,000 ft altitude is the highest pass. It is quite strange that from early April and May, we do not see snow at this height. Top of the pass is fully covered by mist most of the time. Prayer flags hang on top of the pass.