The Silla–Tang War (670–676) occurred between the Silla kingdom of Korea (joined by Goguryeo and Baekje loyalists) and the Tang dynasty of China. It began in the geopolitical context immediately following the conquest of Goguryeo and Baekje by the joint forces of Silla and Tang.
Due to the internal political situation in both Silla and Tang, the conflict ended in a truce and Tang withdrawal from the Korean Peninsula south of the Taedong River. The subsequent territorial line between Tang and Unified Silla extended from the mouth of the Taedong River in the west to the East Korea Bay.