Celduin
In
J. R. R. Tolkien's fictional
Middle-earth, the
Celduin or
River Running was a 600-mile long
river that ran from the
Lonely Mountain south through the
Long Lake where it was joined by the Forest River and thence through the easern outskirts of
Mirkwood, then south east through apparently uninhabited regions of
Rhovanion to its confluence with the
Carnen and finally in a long south-eastward loop to the great inland Sea of Rhûn.