Khlong Phadung Krung Kasem (Thai: คลองผดุงกรุงเกษม, pronounced [kʰlɔ̄ːŋ pʰā.dūŋ krūŋ kā.sěːm]) is a canal (khlong) in Bangkok. It was dug in 1851 in order to serve as a new outer moat for the expanding city, extending its boundaries from the Rattanakosin Island to the north and east.