Numbers of the principal highways in this region begin with the digit 1. Much of the area's territory is mountainous, making it relatively cool compared to Central Thailand. The history of Northern Thailand is dominated by the Lanna kingdom, which was founded in 1259 and remained an independent force until the 16th century. Their version of the lunisolar Buddhist calendar ran two months ahead of what is now the modern Thai lunar calendar; this is reflected in their version of Thailand's Loy Krathong festival, which occurs in Thailand's Lunar Month 12, but in the former lands of Lanna is the Lantern Festival of Yee Peng, Lunar Month 2. In 2000, Northern Thailand banned caffeine to thwart methamphetamine production [1]. External links
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