1st of September is Seub Nakhasathian Memorial Day.
Seub Nakhasathian was a well-known Thai conservationist, because of his efforts to conserve and protect nature in Huai Kha Khaeng Wildlife Sanctuary and Chiew Larn.
He was a project leader for wildlife evacuation in the Chiew Larn Dam project, He managed to save hundreds of animals but he was aware that many more were unable to escape and died. This experience, that he saw as a failure of the Chiew Larn project, and having seen many people trying to invade the forest, led him to protest against further logging and dam construction projects.
He committed suicide on September 1, 1990 in a call for the importance of conserving natural resources. He left a note at the place of his suicide at the Huai Kha Khaeng Wildlife Sanctuary headquarters explaining the reasons for his suicide and leaving his assets to the Khao Nang Rum research station.
After his death, his fellow conservationists launched the Seub Nakhasathien Foundation in his memory to crusade against the destruction of nature.