Introduction to Rivers Rivers are flowing bodies of waters. There are rivers on every continent except Antarctica. Rivers are an important part of the Earth's water cycle and the sculpting of the Earth's topography as they carry huge quantities of water from the land to the sea. The Course of a River Rivers generally start at a source, like a snow melt such as a glacier or a natural spring. Most rivers flow into a larger body of water, like an ocean, sea, or large lake. The early course of a river is often in steep, mountain areas, with rapidly-flowing cold water.
World's Major Bodies of Water
Oceans and Seas
Water bodies constitute areas of water — both salt and fresh, large and small — which are distinct from one another in various ways. From pond to Pacific, bodies of water rank among the most significant natural resources on the planet, to say the least. Oceans account for the largest types of water bodies. All marine saltwater on Earth technically connects in a single World Ocean, but the arrangement of continents makes it more common to distinguish between individual ocean basins. Humankind depends on oceans for food such as fish and squid , for transport via ships and for their enormous influence on the atmosphere and global water and nutrient cycles. Though these and most other seas join directly to the ocean, certain landlocked bodies of saline water go by the name, notably the Caspian Sea.
World Map - Political
A strait is natural narrow water way that connects two large water bodies. In other words it can be also be defined as a thin channel of water way which separates comparatively two enormous water bodies. Isthmus is just opposite to a Strait. A thin piece of land which connects two bigger lands is called Isthmus.