The Guder is a river of central Ethiopia. It is a tributary of the Abay or Blue Nile on the left side; tributaries of the Guder include the Dabissa and the Taranta. The Guder River has a drainage area about 7,011 square kilometers in size. A Greek resident built the first bridge over the Guder in 1897. See also List of rivers of Ethiopia Notes Rivers of Ethiopia Tributaries of the Blue Nile