一切經音義 1.246

1.246

洲渚（上之由反下之與反爾雅云凡水中可居曰洲小洲曰渚廣雅洲居也渚止也或從阜作陼亦同）。

洲渚 (The first character has the fanqie zhi + you [zhōu]; the second has the fanqie zhi + yu [zhǔ]. The Erya says: 'Any place within water that is habitable is called a zhōu; a small zhōu is called a zhǔ.' The Guangya says: 'Zhōu means a dwelling; zhǔ means a halting place.' It is also written with the fù [阜] radical as 陼, which is the same).