Glencastle

Glencastle () is a small village, electoral division and townland in the northwest of County Mayo, Ireland. The townland of Glencastle has an area of approximately .

== Topography == Glencastle is a mountain valley which was once known as the gateway to the Mullet Peninsula. In the middle of this glen stands an ancient fort called "Dun Donnell" or the fort of Domhnall. Domhnall was, according to legend, of the Gamanraige tribe and an ascendant of Ailill Finn, the husband of Flidhais, and involved in the tale of Táin Bó Flidhais. As part of the cycle of Celtic folklore and legends, Domhnall used to close the gates of Erris at night levying tolls on passers-by.