Khlong Rop Krung (Roman letters: Khlong Rop Krung) is a canal dug around the middle city (second floor) that King Rama I ordered to dig in 1783 when the capital was moved from Thonburi. on the Phra Nakhon side At that time, the eastern city The terrain is sharp and curved. There is a river on three sides. the inner part which is attached to the land It has dug a moat since the Thonburi period. therefore has an island-like shape His Majesty King Buddha Yodfa Chulalok graciously To demolish the remains of the original Bangkok fort and the city wall of the Thonburi period. to expand the wall and moat of the new city to be wider This new Phra Nakhon moat was graciously pleased. to dig parallel to the original moat line Starting from the riverside at Bang Lamphu crossing the river south The area above Wat Sam Pluem, 85 lines long, 13 wa wide, 10 wa deep, 5 cubits, was bestowed the name "Khlong Rob Krung" Most people often call the canal differently according to the place where the canal passes. "Khlong Saphan Han" when passing Wat Choeng Len is called "Wat Choeng Len Canal" and the last section is called "Ong Ang Canal" because it used to be a trading center for Mon and Chinese pottery. On the occasion of the Rattanakosin celebration of 1982, the Cabinet resolved on December 7, 1982 to name this canal correctly as "Klong Rob Krung"