the Parana river overflows its banks 巴拉那河都会泛滥
where one massive tributary, the Rio Negro, flows into the main river. 一条巨大的支流 ——内格罗河在此汇入干流
The Mara river, snaking across the plains of East Africa. 马拉河蜿蜒地穿过东非平原
This river has cut the world's longest canyon system - 这条河冲蚀出了世界上最长的峡谷系
Arizona's Colorado river has eaten away at the desert's sandstone 亚利桑那州的科罗拉多河 冲走了大量沙石