When rivers hit larger bodies of water (such a lake or the sea), the flow slows down considerably and many of the heavier particles drop down and sink to the bottom.
Uma imifula ifika kumitimba lemikhulu yemanti (sitiba noma lwandle), lokuhamba kwlamanti kuyancipha bese incumbi yetinfo letesendzako tehlela phansi bese tindanda ngetulu.