Before 2012, the International Science Olympiads were held every two years, and some regional geography Olympiads were held during intervening years. These include the Asia Pacific Regional Geography Olympiads (APRGO), which were held in 2007 (Hsinchu, Taiwan), 2009 (Tsukuba, Japan), and 2011 (Merida, Mexico), and the Central European Regional Geography Olympiads (CERIGEO).
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