In the 1969 narcotics crisis, during which hill tribes villagers in the northern territory grew opuim, King Bhumibol Adulyadej established the Royal Project centred at Fang District under his command to encourage the hill tribes to renounce opium-growing.
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The Prince and his family reside officially at Pramual Palace, at Pramual road, Silom, Bangkok but usually reside in his private residence in the area of The Royal Project Development and Agricultural Centre, Doi Ang Khang, Fang District, Chiang Mai Province.