Rare term for an artificial or natural water channel. In modern Japanese, 水路, 運河, or 川 are far more common.
On old maps, a waterway is drawn around this area.
Everyday word for river; 渠河 is an uncommon, formal alternative.
Compound of 渠 (ditch, canal) and 河 (river). The exact historical derivation is uncertain; the spelling is conventionally associated with waterways.