The smallest river in the world is the Serrano River in Uruguay, which is 104 meters long. The Serrano River is located in the San José Department of Uruguay. It originates from Lake Encarnacion, then flows through a farmland and finally flows into the Uruguay River. Although the Serrano River is very short, it is an important water source for local agriculture and ecosystems, supplying irrigation and rich biodiversity in the surrounding areas. Not only the length of the river, but also the importance of its watershed and ecosystem need to be considered to fully assess the meaning of "smallest".

Haolai River We all know that the largest river in the world is the Amazon River, but do you know which is the smallest river? It is the throat river of Chifeng, Inner Mongolia - the Haolai River. The narrowest part is only 4 centimeters, and even large fish cannot swim across.