UNESCO has this year declared Doi Chiang Dao in Chiang Mai to become the latest UNESCO Biosphere Reserve. Now that Thailand has five biosphere reserves stretching from the north to the upper south, it is time to look back to the beginning of it all. Here's to Thailand's very first UNESCO Biosphere Reserve at Sakaerat Environmental Research Station (SERS) in Wang Nam Khiao District of Nakhon Ratchasima.