Ardlougher is a townland located in the Electoral Division of Mulmosog, within the Civil Parish of Killybegs Lower, the Barony of Banagh, and County Donegal.

It spans an area of 741,561 square metres, which equates to approximately 74.16 hectares, 0.29 square miles, or about 183 acres. Nationwide, it is the 37,433rd largest known townland, and within County Donegal, it is the 1,772nd largest townland.

Ardlougher shares its borders with the following townlands:

• Ardvally to the west.

• Cronkeeran and Meentanadea to the east.

• Moy to the north.