Glen Rushen is the long valley that runs from Cronk yn Irree Lhaa to the sea at Glen Maye in the parish of Patrick. W. Walter Gill, describing it in A Manx Scrapbook in 1929, found that its reaches carried different names. From Glen Maye to the bend at Ballacottier it was Glion Mooar, the Big Glen, as on the Ordnance map, and the next section was the authentic Glion Rushen, the Brushwood Glen. Above that came Glion y Can, then Glion ny Brack, the Glen of the Trout, and above Dalby Bridge Glion ny Ghoayr, the Glen of the Goat, which begins in the marshy ground called Chibbyr Pooyl Sallagh, the Muddy-pool Well. Gill also recorded an old saying that Glion Rushen ny Sleityn, Glion Reeagh Rushen and Glion Rushen ny Cheayn were the three Glen Rushens of the Isle of Man, the Glen Rushen of the mountains, the sportive Glen Rushen and the Glen Rushen of the sea. He could not tell whether the saying meant three different glens or the three natural sections of this one, since only one Glen Rushen was then known.

The witch story told of this glen has two printed forms, and the earlier does not place it here. Its earliest printed form is William Kennish's poem Old May Eve, in his Mona's Isle of 1844, in which the witch Kate flies home at cockcrow to Glen reagh Rushen. A Manxman whose gun has failed to fire remembers his grandmother saying that witches could be shot to death with silver, tears the two silver studs from his wrist-bands, rams them down the barrel and hits in the thigh the hare the witch has become. At break of morning a wounded hag was seen hobbling away and leaving a trail of blood. Kennish's own note places Glen reagh Rushen in Kirk Christ Rushen, the parish of Rushen, as a glen famed for being the resort of all kinds of supernatural beings. Gill, weighing the note in 1929, concluded that Kennish plainly did not think the glen was in Patrick. His own belief was that Glion Reeagh Rushen, famous in the legend of the Fenodderee, was the upper part of Silverdale Glen above Ballasalla, a place called Russin in the twelfth century. A later version, in which a witch of Glen Rushen commands the wind and sets the dog-fish on the fishermen's nets before being shot as a hare with silver buttons, is reported from Charles Roeder's Manx Notes and Queries of 1904, reprinted from the Isle of Man Examiner, and has not yet been checked against the original newspaper.