Where does “薩摩川內” come from?

薩摩川內 (Chinese) comes from Japanese 薩摩川内, from Japanese 薩摩 — (薩摩郡).

Ancestry of “薩摩川內”, step by step

StepLanguageWordMeaning
1Japanese薩摩川内—
2Japanese薩摩(薩摩郡)
Every word from Japanese 薩摩 →Every word from Japanese 薩摩川内 →
薩摩川內 — Etymology, Origin & Word History | Etymology Explorer