siōng-iû上游

upper reaches

upper reaches; upstream portion of a river; favourable position; advantage; edge; (one's) superior; superordinate; upstream

English Wiktionary, “上游” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E4%B8%8A%E6%B8%B8 · confidence: Medium (Wiktionary, Hokkien)