lúdìngqiáo
Luding Bridge over Dadu river 大渡河[Dàdùhé] in Sichuan, built by Kangxi in 1706, linking Luding county Sichuan Luding county 瀘定縣|泸定县[Lúdìngxiàn] with Garze Tibetan autonomous prefecture 甘孜藏族自治州甘孜藏族自治州[GānzīZàngzúzìzhìzhōu]
Not found in HSK word list
42599th most common word in books