A khlong also commonly spelled Klong is the Thai word for a canal. These canals are fed by the Chao Phraya, the Tha Chin, the Mae Klong Rivers and tributaries. Once upon a time Bangkok was crisscrossed by khlong and so gained the name Venice of the East. The khlongs were used for transportation and floating markets. Most of the khlongs of Bangkok have been filled in and converted into streets and highways, which has resulted in Bangkok's famous flooding after the monsoons as water cannot flow properly into the Gulf of Thailand.