續一切經音義 2.57

2.57

旋澓（下符福反三蒼曰旋澓謂河海中洄流深處是也前已釋竟）。

旋澓 (The second character is pronounced with the fanqie *f-*, [fu], from 符 and 福. The *Sancang* states: '旋澓 refers to deep places where currents swirl in rivers and seas.' It has already been explained above.)