The term for a large body of saltwater smaller than an ocean is a "sea." Seas are typically partially enclosed by land and are connected to oceans. They play a critical role in the Earth's ecosystem, supporting marine life and influencing weather patterns. Examples of seas include the Mediterranean Sea and the Red Sea. Seas can vary significantly in size, depth, and salinity and serve as important bodies of water for transportation, fishing, and recreation. Additionally, they are often sites of rich biodiversity and have cultural and economic significance for the regions surrounding them.