Phra Sumen Fort is a fortress built during the reign of King Rama I. At that time, 14 forts were constructed to protect the city, but over time, these fortifications became unnecessary and were dismantled. Phra Sumen Fort is one of just two that still remain today, the other being Mahakhan Fort. The name Phra Sumen Fort has been adopted as the name for Phra Sumen Road. This fort, established in the time of King Rama I, showcases beautiful architecture and serves numerous purposes. It features ramparts, gun ports, an ammunition storage room, and various weaponry. However, natural decay took its toll. By 1981, the Fine Arts Department undertook restoration efforts based on photographs from the era of King Rama V, returning it to its former glory. Surrounding areas were also transformed into a public park named "Santhichai Prakan Park," which includes a pavilion known as "Phra Thinang Santhichai Prakan." The community surrounding Phra Sumen Fort is the Phra Arthit Road community, known for its strong participatory spirit, much like the Mahakhan Fort community, but with even greater diversity. In the reign of King Rama I, specifically in 1783, around 10,000 Khmer people were brought in to dig a canal connecting Bang Lam Phu Canal to Oon Ang Canal, thereby creating the waterways that encircle the city.