also: たいせん
noun
big river; large river
General term for a large river. Often used in place names. The reading おおかわ is the common kun-reading; たいせん is a rare on-reading.
See also: 大河
この大川は県境を流れている。
This big river flows along the prefectural border.
大川のほとりに小さな集
There is a small settlement on the banks of the large river.
大河 is a more literary or formal term for a great river, often used in titles or poetic descriptions, while 大川 is a straightforward, everyday word for a big river.
Compound of 大 (big) and 川 (river). The reading おおかわ is the native Japanese kun-reading; たいせん is the Sino-Japanese on-reading, which is rare for this word.