Khlong Mon has been dug since Ayutthaya period and delineates the border between Bangkok Yai and Bangkok Noi Districts.

It has a starting from the west bank of the Chao Phraya River at the area beside the Royal Thai Navy Council passing Khlong Ban Khamin, which is the original city moat since Thonburi was the capital, to reach Khlong Bang Khun Si, also known as Khlong Chak Phra, which is the original Chao Phraya River, and Khlong Bangkok Yai.

Then itself continuing on to the west as Khlong Bang Chueak Nang.

Khlong Bang Chueak Nang when flowing to Wat Ko temple, it splits into two courses, the upper course called Khlong Bang Noi, while the lower course called Khlong Bang Chueak Nang and formed a boundary between Taling Chan with Phasi Charoen Districts.

Therefore, a post was constructed on the khlong to be a checkpoint of the transported merchandises and passengers.