The start of the River Nile is the confluence, near Khartoum, of the White Nile and Blue Nile.
The Ohio river is formed by the confluence (meeting) of the Allegheny and Monongahela rivers.
The Athabasca River starts at the Columbia Glacier in Jasper National Park in Alberta, Canada.
No. The confluence of Madison River and Jefferson River, near Gallatin River, in Gallatin County, Montana.
The Missouri River begins as Brower's Spring in the state of Montana.
Actually Jamuna is the downstream course of the Brahmaputra which originates in the Chemayung-Dung glacier.
River Ganges starts from the Gomukh glacier situated 18 kms far from Gagotri dham in Uttarkashi district of Uttrakhand. Gangotri Dham is a temple dedicated to goddess Ganga(river ganga), it is one of the char dham.
Given the massive period of time this would cover, it is impossible to even start coving such a timeline here. I suggest you Google up ' Ganga River' for a fairly comprehensive answer - in particular Wikipedia.
The Chattahoochee River runs from the Chattahoochee Spring in the Appalachian Mountains of north-eastern Georgia until it merges with the Flint River and other tributaries at Lake Seminole, near Bainbridge to form the Florida panhandle's Apalachicola River.
The point of origin for a river is its source.The locations near its start may be called "headwaters." The usual source of a river is a pond, creek, spring, or other small body of water. Where there are multiple sources, the one that is highest in elevation is usually considered the primary one.
The Yangtze River Starts in a glacier on the west side of the Geladandong Mountain in the Dangla Mountain Range in the eastern part of the Tibetan plateau, and ends in the East China Sea at Shanghai.
The Missouri's source is Brower's Spring in Montana.
Danube river, Delaware river