Rivers begin in high places, such as in a mountain or hill, as rivers always flow downhill. The river Severn, for example, starts in a boggy marsh in Wales. They also usually start in a bog, lake, marsh, etc. !!
Generally begins high inthe Mountains, where rain or snow has gatherred in the dips and cracks of mountain peaks. Some rivers starts form springs int hei mountainsside.!Other beginsas mountains marshes, or as rain water that seeps through sponge, like rock.

India's mall northern rivers origin from glaciers .............and south india's river origin from rainfalls

From the hill tops

The river is the sculptor of its valley, and provides the major water-source for all the animal and plant life in the area.
Rivers begin rather unpretentiously. They are lazy. They follow the force of gravity until they find the most convenient way to flow downhill. This is governed by the topography of the area in which they flow. In time, the river begins to modify this landscape until it creates a valley. The average river system, if viewed from above, looks like a many branching tree. Hundreds, perhaps thousands, of small rivulets flow into slightly larger branches, which in turn flow into tributaries. Eventually the water makes its way into the main body of the river.
What does all this mean? While we patiently sit along the rivers bank, it's easy to imagine this single entity, lazily meandering as it begins its long journey. However, exactly the opposite is true. The river is the product of thousands of miles of tiny rivulets that completely dissect the surrounding terrain. As ...more

As the ice melted on mountains they gushed in form of rev lutes down side, accumulation of evolutes made more powerful gushing water source called revers. in hot countries the rainfall coming down is called rivers