The Royal Flora Ratchaphruek was an international horticultural exposition held 1 November, 2006 to 31 January, 2007 in the Thai city Chiang Mai of Chiang Mai Province that drew 3,781,624 visitors. Recognized by the Bureau International des Expositions (BIE), it was one of the grand celebrations hosted by the Royal Thai Government in honor of King Bhumibol, the world's longest reigning monarch.