Doi Larng's a northern spur off Doi Phahompok (2nd highest mtn), running along the Burma border. Khun Sa hung out here for many years, before moving to Homong north of Mae Hong Son. One year he lost a big heroin shipment out of Bkk due to a tip off (set up?) & he got a bit angry, so they drove down the mountain in their picks up 7.30am, waited for the bank in Mae Ai to open, robbed it and then promptly drive back up the mountain to their camp a hundred metres across the border in Burma. The road basically runs along the border in places, not unlike the Doi Tung - Mae Sai Rd. After Khun Sa's little revenge I think they rapidly built the roads to gain full access to the border area & patrol what was going on.