Highway 528A is a short route located on the northern edge of Parry Sound District in central Ontario, which provides access to several private recreational properties that front Wolseley Bay, a large body of water attached to Lake Nipissing to the northeast and forms the delta of the Wolseley River. The short 5.1-kilometre (3.2 mi) highway begins at Highway 528 approximately 1.5 kilometres (0.93 mi) west of the community of Wolseley Bay, and travels southeasterly. It passes through dense forest for the majority of its entire length, though grasslands appear briefly near the midpoint of the route. Though the route is located in the Canadian Shield, there are no rock outcroppings visible along its length. The highway ends at a cul-de-sac where a private driveway continues to a lodge.
^"Ontario Secondary Roads Now Designated 500, 600" 112 (33,119). The Globe and Mail. February 4, 1956. p. 4. "Two new Ontario road numbers appear on the province's 1956 official road map which will be ready for distribution next week. The new numbers are the 500 and 600 series and designate hundreds of miles of secondary roads which are wholly maintained by the Highways Department. More than 100 secondary roads will have their own numbers and signs this year. All of these secondary roads were taken into the province's main highways system because they form important connecting links with the King's Highways"