Regional seas are large bodies of saltwater that are partially enclosed by land and are typically associated with specific geographic areas. They play a crucial role in the Earth's ecosystem, supporting diverse marine life and providing resources such as fish and minerals. Examples of regional seas include the Mediterranean Sea, the Caribbean Sea, and the Red Sea. These seas are often influenced by surrounding landmasses, climate, and ocean currents, which can affect their temperature, salinity, and biodiversity. Regional seas also serve as important routes for shipping and trade, connecting different countries and facilitating economic activities.