Its namesake gorge is a notable fossil site, and it is known as Abbai in Ethiopia, where it flows from Lake Tana.  
Measuring about 860 miles long, its tributaries include the Rahad and Dindar.  Its namesake gorge is a notable fossil site, and it is known as Abbai in Ethiopia, where it flows from Lake Tana.  It is dammed at Roseires and Sennar for farming, while a larger dam downstream reduces the effects of its flooding, since its high volume each summer had caused annual floods in Egypt.  FTP, name this river that merges in Khartoum with the White Nile.
Measuring about 860 miles long, its tributaries include the Rahad and Dindar.  
Blue Nile or Al Bahr Al Azraq (do not prompt on "Nile")