Silom (or Si Lom, Thai: สีลม windmill) is a sub-District and road in Bang Rak district, Bangkok, Thailand. Constructed in 1851 as part of a dyke and irrigation system, Silom road has become one of Bangkok's most cosmopolitan streets and major financial centre; it is the home to some of the largest companies in Thailand, including the Charoen Phokphand Group (CP), Bangkok Bank PLC, and a number of insurance and securities firms. silom is sometimes called the "Wall Street of Thailand".