Kilrean Lower is a townland located in the Civil Parish of Killybegs Lower and the Electoral Division of Ardara, County Donegal. Its Irish name is Cill Riáin Íochtarach.

It spans an area of 1,304,597 square metres, which equates to approximately 0.50 square miles or 322 acres.

Kilrean Lower shares its borders with the following townlands:

• Kilrean Upper to the east.

• Tullyard to the north.

• Coraness Glebe and Drumnacross to the south.

• Clonconwal, Garvegort Glebe, Gortnacart Glebe, and Urbaldeevan to the west.

The area includes the subtownlands of Stranacross and Gortlock.