meander:Physical Geography. A pronounced loop-like bend (usually one of a series) in the course of a slow-moving river, tending to become more exaggerated as a result of erosion of the bank on the outside of the curve and deposition on the inside.——Oxford English Dictionary

meander:if a river, stream, road etc meanders, it has a lot of bends rather than going in a straight line.——Longman Dictionary of Contemporary English  @zh

宽阔且弯曲如环的河道或溪道。——AAT-台湾  @zh

曲流  @zh