Knocknashinna ward lies within the rural landscape of County Down, characterised by a mix of agricultural land and small residential settlements. The area is defined by its proximity to the Mourne Mountains, with the terrain featuring gentle hills and fields. Local roads connect dispersed homes and farms, shaping a community oriented around the surrounding natural environment.
The settlement of Leitrim serves as a focal point within the ward. A specific local landmark is the historic Kilbroney Parish Church, which sits within the ward's boundaries. Daily life here is closely tied to the land, with the local economy supported by farming and related activities, reflecting the area's quiet, residential character.