Alexander Stewart Provincial Park is a nature reserve in McNab/Braeside, Renfrew County, Ontario, Canada, about 11 kilometres (7 mi) west of the centre of Arnprior. This nature reserve contains a hardwood forest of several species including Maple, American Beech, Basswood, Blue-Beech, and Bur Oak. The subsurface is clay silt, a remnant of the ice age Champlain Sea. The site is at an elevation of 130 metres (430 ft). The park, located at the northwest intersection of Maple Bend Road and Russett Drive, is a non-operating park, meaning there are no facilities or services.