蘭 (Lân)iâng溪 (khe) (蘭陽溪),較早 (khah-chá)號做 (hō-chò)宜蘭 (Gî-lân)濁水溪 (Lô-chúi-khe) (宜蘭濁水溪),是 (sī)一 (chi̍t)條 (tiâu)位佇 (ūi-tī)台灣 (Tâi-oân)東北部 (tang-pak-pō͘)蘭iâng平埔 (Pêⁿ-po͘)的 (ê)大條 (toā-tiâu)溪水 (khe-chúi),也 (iā)是宜蘭縣 (Gî-lân-koān)境內 (kéng-lāi)上重要 (siōng-tiōng-iàu)的溪水。蘭iâng溪的主流 (chú-liû)全長 (choân-tn̂g)有 (ū)73公里 (kong-lí)。蘭iâng溪發源 (hoat-goân)宜蘭縣參 (chham)臺中市 (Tâi-tiong-chhī)交接 (kau-chiap)所在 (só͘-chāi)的南湖 (Lâm-ô͘)北山 (Pak-soaⁿ)。蘭iâng溪流經 (liû-keng)三星鄉 (Sam-seng-hiong),員山鄉 (Îⁿ-soaⁿ-hiong),五結鄉 (Gō͘-kiat-hiong),宜蘭市 (Gî-lân-chhī)佮 (kap)壯圍鄉 (Chòng-ûi-hiong),最後 (chòe-āu)樓入 (lâu-ji̍p)太平洋 (Thài-pêng-iûⁿ)。