Which Sichuan does Sichuan refer to?

In ancient times, our ancestors created the division of Sichuan culture in and around the basin, which was designated as Ba County and Shu County in Qin Dynasty and Yizhou in Han Dynasty. In the Tang Dynasty, it was changed to Jiannan Road, which was later divided into Jiannan Xichuan Road and Jiannan Dongchuan Road, and administrative offices were set up in Chengdu and Santai County respectively. There were only two rivers in Tang Xuanzong's past, so it was called "two rivers" for short. During the reign of Emperor Xuanzong of the Tang Dynasty, this division was adjusted, and Jiannan Xichuan Road, Jiannan Dongchuan Road and Shannan West Road were set up (Shannan West Road governs southern Shaanxi and northern Sichuan and is located in Hanzhong). In this way, there is the abbreviation of "Sanchuan". Now, due to the adjustment of Song Zhenzong, Kuizhou (Fengjie) has been set up in addition to Yizhou (Chengdu), Hippo Chef (three sets) and Lizhong (Hanzhong), so Sichuan has emerged.