Milakatong La
Milakatong La or Menlakathong La is a historic mountain pass along the trade route between Tawang in India's Arunachal Pradesh and Tsona Dzong in Tibet's Shannan province via the valley of Tsona Chu.
Location
The Ludlow–Sherriff expedition to Tibet identified the location of Milakatong La at, at the top of a branch valley of the Tsona Chu valley, leading down to the Tsechu village.Following the valley upstream along Tsona Chu leads one to Tsona Dzong. Following it downstream leads one to the Tawang Chu river.
Other sources suggest a location near the 'Bum La' pass of Ludlow-Sherriff, described as being between "Tulung La and the Bhutan border". The McMahon Line map of 1914 places the Indo-Tibetan border along the mountain range on this axis :
This pass also leads to another branch valley of the Tsona Chu valley, which lies north of the border.
Both passes were likely used for trade between Tawang and Tsona Dzong. This perhaps explains the confusion among sources.