Freshwater bodies, such as rivers, lakes, and ponds, contain low concentrations of salt. They are essential for drinking water, agriculture, and supporting diverse ecosystems. Common examples include the Great Lakes and the Amazon River. Saltwater bodies, primarily oceans and seas, have high salt concentrations. They cover about 71% of the Earth's surface and are crucial for global weather patterns and marine life. Notable examples include the Pacific Ocean and the Mediterranean Sea. Both freshwater and saltwater bodies play vital roles in the planet's ecology and human activities.