Before reaching the city, there is a small archaeological site located on Nitthayo Road, along National Highway No. 22, near kilometer marker 161 on the Sakon Nakhon-Udon Thani route. The historical background of the stone bridge dates back to its registration as a historical site by the Fine Arts Department in 1935. At that time, the bridge measured 4 meters in width and 16 meters in length. The reason for its designation as a historical site was due to its local nickname, "Khmer Bridge." At one point, a mayor (the second mayor of Sakon Nakhon province) noted that the stone bridge obstructed the road, causing it to bend and curve to avoid the structure. In an effort to address this, gravel was used to cover the natural large stones of the bridge entirely. However, the road construction through the bridge never materialized. Once that mayor’s term ended, the new mayor began excavating the gravel, only to find that the original bridge was in a state of disrepair. Consequently, he requested funds from the Fine Arts Department to rebuild it, using laterite stones to create a new structure featuring three steps for access. In actuality, the original stone bridge was not built according to Khmer architectural principles. Instead, it served as a passageway for water from Nong Sanom, which drained into Nong Han. At that time, the bridge likely functioned as a walkway, connecting Sakon Nakhon to its outskirts. Given that Sakon Nakhon is situated in a low-lying area prone to flooding, having a bridge was essential for the transportation of people. Near the bridge, there is a recreational area for the people of Sakon Nakhon known as "Lan Ruam Nam Jai." This spot provides an excellent view of the stone bridge as well as the city gates, which feature bronze statues of revered figures such as Phra Ajaan Man Phurithatto, Phra Ajaan Fan Acharo, and Phra Ong Saen, all renowned for their beauty. It is also a location of royal significance, as Her Majesty the Queen has visited to pay respects whenever she travels to Phu Phan Royal Villa. To access the stone bridge, it is located along Nitthayo Road, which connects Sakon Nakhon and Udon Thani. As you enter Sakon Nakhon, the bridge will be on your right; conversely, when leaving the city, the bridge will be on your left.