Myo Thant, leader of the Mountaineering Association, said an eight-member team set out to climb Hkakabo Razi last month, but due to the narrow nature of the summit, only two continued on the final stretch.
The men reached the ice-capped peak Aug 31, but reported before making their descent that their battery was weak, he said. They were supposed to reconnect with their colleagues at base camp Monday, but did not show up.
When the nation's peaks were surveyed in 1925, back when the area was part of the British Indian empire, Mount Hkakabo was measured at 5,881 metres, which would make it the highest, not only in the country but in all of Southeast Asia.
Thant said his climbers confirmed that height with a GPS device.
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However, satellite and digital data, together with recent US, Russian and Chinese topographical maps, indicate the real title may belong to Gamlang, also in Kachin state.
The last person who scaled Hkakabo was Japanese climber Takashi Ozaki, who reached the peak in 1996.