Which term is used to describe the vast saline body of water bordering landmasses?

The term that accurately describes the vast saline body of water bordering landmasses is "Mar / Océano." This term encompasses both sea and ocean, which are large bodies of saline water. Seas are typically smaller than oceans and can be partially enclosed by land, while oceans are the largest water bodies that cover extensive areas of the Earth’s surface.

Both seas and oceans play a crucial role in global climates, ecosystems, and human activities. The distinction between these bodies of water is essential in geography and environmental science, especially when discussing maritime boundaries, marine biology, and navigation.

The other choices do not fit the description of a saline body of water. A lake refers to a smaller body of freshwater surrounded by land, calm waters do not refer to a specific type of large body of water, and río means river, which is a freshwater body flowing towards another body of water, not an expansive saline body.