Seyh Mehmed ibn Seyh Muhammed Piri Halife el-Hoyi: Hizirname (Book of Khidr)  (d1493)

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Taken from: The Journey of an Ottoman Warrior Dervish: The Hızırname (Book of Khidr) Sources and Reception by SIBEL KOCAER  Official name of the book: Divan-ı  Seyh  Muhyiddin. 

Poem29: The Origin of the Nile and a Description of the City of Euphrates;

The Journey to Mount Qaf (1) and to the Deepest Ocean (bahr-i  muhit) and Other Wonders.

I saw the origin of the Nile, it is at Mount Qaf (1) and it is on the way to Khidr Khan (2).

The source of the Nile is a dome. Khidr (2) was my companion and I journeyed and witnessed these realms. There are two huge doors, one is the Nile and the other is the Euphrates. The sea reaches a city; it is an island in a salty sea. Its name is Mirat (3). The name of the sea is Ummu’l-buhur. The city is built of gold and silver and has twelve thousand doors.