Ottawa Valley in the context of Pembroke, Ontario

King's Highway 41, commonly referred to as Highway 41, is a provincially maintained highway in the Canadian province of Ontario. The 159.6-kilometre (99.2 mi) highway travels in a predominantly north–south direction across eastern Ontario, from Highway 7 in Kaladar to Highway 148 in Pembroke. The majority of this distance crosses through a rugged forested region known as Mazinaw Country. However, the route enters the agricultural Ottawa Valley near Dacre. A significant portion of Highway 41 follows the historic Addington Colonization Road, built in 1854.

Highway 41 was first assumed in 1935, though ironically the initial route is no longer part of the highway. It was extended north to meet the eastern terminus of Highway 60 at Golden Lake in 1937. The following year, a southern discontinuous section of the highway was established north from Picton in Prince Edward County. A series of changes in 1957 extended Highway 60 east to Renfrew and Highway 41 north to Pembroke; this established a concurrency of the two highways through Eganville, which remains to this day.

Petawawa (/ˈpɛtəwɒwɒ/ PET-ə-WAW-waw) is a town located in the eastern portion of Southern Ontario, Canada. Situated in the Ottawa Valley, with a population of 18,160 (2021 Census), Petawawa is the most populous municipality in Renfrew County.