In the past, The areas in front of Thammasat university that follow the banks of the river stretching downward to wat arun ratchawararam were actually one piece of land. Without the river flowing through as it does today. The Former Chao Phraya river's stream line flowed by passing Bangkok Noi canal to taling chan area and made a roundabout way to meet Bangkok Yai canal of the present-day. Later during the year 1534-1546, Somdet Phrachai rachathirat, The king of Ayutthaya had ordered to dig a short-cut canal in the area of the Narrowest isthmus, Starting from the mouth of Bangkok noi canal, to the mouth of Bangkok Yai canal, Named it Khlong Lat Bangkok(Bangkok short-cut canal), Which then turned to be the same stream as Chao Phraya river until today.