River Nile
From Tardis Wiki, the free Doctor Who reference
The River Nile was in Egypt. The Doctor travelled down the Nile with Ediphis. (DWM: The Power of Thoueris!)
During the alternate timeline of The Year That Never Was, the Master had the Nile frozen over. (DW: Last of the Time Lords)
In another alternate timeline, penguins lived on the Nile. (DW: The Big Bang)
