National Canal Conservation Day is observed in Thailand every September 20. Established in 1995, this day highlights the significance of khlongs, or canals, as historical and cultural landmarks, as well as tourist attractions. The canal system in Thailand originated from moats dug for city protection, with Bangkok's extensive network of canals earning it the nickname "Venice of the East." While the canal-based transport system has diminished due to increased road construction, many khlongs remain, particularly in the historic Thonburi area of Bangkok. This day also addresses the issue of canal pollution, which poses health risks due to pathogenic microbes. Activities often include volunteer cleanups and environmental awareness campaigns to combat this growing problem.