Carleton-Mississippi Mills Boundaries Description Consisting of:

(a) that part of the County of Lanark comprised of the Town of Mississippi Mills; and

(b) that part of the City of Ottawa lying westerly of a line described as follows: commencing at the intersection of the southwesterly limit of said city with the southerly corner of the former Township of Goulbourn; thence northeasterly along the southeasterly limit of said former township to McCordick Road; thence northwesterly along said road and Eagleson Road to the southerly limit of the former City of Kanata; thence northeasterly, northwesterly and southwesterly along the southerly and easterly limits of said former city to Eagleson Road; thence generally northwesterly along said road, March Road, Herzberg Road and March Valley Road (Fourth Line) to Riddell Drive; thence northeasterly along said drive and its production to the interprovincial boundary between Ontario and Quebec.

See also the official information at: Elections Canada - Map of Riding