tribehtml> The Trip - Hill Tribes

Many of these people don't know or don't care what country they live in. They cross the borders as they please. The climate up in the hills is colder and dryer than it is elsewhere in the region (which is tropical), making it ideal for growing opium. Thus the majority of the world's opium comes from this region (the corner where Burma, Laos, Cambodia and Thailand meet), often referred to as the "Golden Triangle".