Where does the blue river start?

There are several rivers named the Blue River, located in different parts of the world. Here are a few notable ones:

1. Blue Nile: The Blue Nile, also known as Abbay River, originates in Lake Tana in the Ethiopian Highlands. It is one of the two major tributaries of the Nile River, the longest river in the world. The Blue Nile contributes the majority of the water volume to the Nile and is considered its main source.

2. Blue River (Colorado): The Blue River is a tributary of the Colorado River, located in the western United States. It begins in the Rocky Mountains of Colorado and flows through Summit County and Grand County before meeting the Colorado River near Kremmling, Colorado.

3. Blue River (Oregon): The Blue River is a tributary of the McKenzie River in Oregon, United States. It starts in the Cascade Range and flows through Lane County before merging with the McKenzie River near Blue River, Oregon.

4. Blue River (Wisconsin): The Blue River is a tributary of the Wisconsin River, located in southwestern Wisconsin. It begins in Grant County and flows through Iowa County, Lafayette County, and Green County before joining the Wisconsin River near Blue River, Wisconsin.

These are some examples of rivers known as the Blue River, each with its own distinct geographical location and origin.