Which water body is referred to as 'Río' in Spanish?

The term 'Río' in Spanish specifically translates to 'River' in English. This designation is used to recognize flowing bodies of freshwater that move across the land, typically feeding into larger bodies of water, such as seas or lakes. Understanding the term 'Río' is crucial, as it conveys the characteristics associated with rivers, such as their flow, habitat, and ecological significance, distinguishing them from still water bodies like lakes or seas, which are often much larger and do not have the same current dynamics. The other terms associated with water bodies do not accurately match the meaning of 'Río' and thus do not belong in this context.