Police received a call around noon after the body was spotted near the busy road.
Responding officers determined that the body belongs to a male and "appears to have been there for some time," the force said in a news release.
York Regional Police maintained a heavy presence in the area as it launched an investigation.
Anyone with information is asked to call the #4 District Criminal Investigations Bureau at 1-866-876-5423, ext. 7441 or Crime Stoppers at 1-800-222-TIPS.