Despite its low height, Gunung Kahung is a very difficult mountain – back in 2010 or so, a hiking group took 12 days to reach the top! SInce then there have been a few vidoes posted on Youtube from local hiking clubs – one with a GPS showing a height of over 1300m at a peak they call ‘Kahung Besar’ (Big Kahung). US Army Maps from 1954 give a height of 1280m and call the range itself Pegunungan Kusan.
Banjarmasin is the nearest airport.
Take a photocopy of your passport photo page just incase.