The Blue Nile originates at Lake Tana in Ethiopia and flows downstream towards Khartoum in Sudan. In Arabic it is called the an-Nil-al-Azraq.
The Blue Nile is a tributary, like the White Nile, and flows into the greater Nile. A tributary by definition feeds a river that flows into a sea or ocean. A tributary does not empty it's water into the sea or ocean directly.
The waters from Lake Tana reach a 250 mile long stretch of canyon where the speed of the river make it a nearly impossible river to navigate commercially.
At the Lake Tana area the river is commonly recognized as the Abbay river. This river section is revered as a holy place. The history of evolution is played out at this area of Ethiopia. Some people think the Abbay is Gihon in the Book of Genesis Eden story. Less theological people might disagree on the Biblical connotations regarding the role of Ethiopia in the evolution of humanity but even these secular scientists have to agree with the evolution markers left in Ethiopia by archeological artifacts such as the 3.2 million year old bones of Lucy.
The Blue Nile enters Sudan and meets up with the Nile at Khartoum.
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