Most of the lakes are found in the Great Rift Valley and they are one of the major sites of tourist attraction. The most prominent Ethiopia lakes are Tana, Abay, Chamo, Shall, Awassa, Abijata, Koka, Hayke and Ashenge. Lake Tana is the largest lake in Ethiopia and is located in the highlands outside the Rift Valley. It is the source of the Blue Nile and is the third largest in Africa, next to Victoria and Tanganyika. The major rivers of Ethiopia include Abby (Blue Nile), Wabe Seheblle, Genale, Awash, Takezze, Omo and Baro. Abbay is the largest river in Ethiopia. It is also called the Blue Nile and is the longest River in the world. The Blue Nile Fall is locally known as ‘Tis Issat” and is situated on the upper course of the river, about 30 kilometer downstream from the town of Bahir dar and Lake Tana. It is considered one of Ethiopia’s best-known tourist attractions.