Тюгоку
Primarily in the tourism industry, in order to avoid confusing the Chūgoku region with China, the Chūgoku region is also called the "San'in‐San'yō region". San'in ("yīn of the mountains") is the northern part facing the Sea of Japan. San'yō ("yáng of the mountains") is the southern part facing the Seto Inland Sea. These names were created using the yīnyáng‐based place‐naming scheme.