MOST POPULAR: Video, stories and more
SIGN-UP: Get breaking news sent to you
Someone spotted the body in the Niles Canyon region and reported it at about 11 a.m., Sgt. Chris Mazzone said.
It was not immediately clear how the man died.
Fremont police initially responded to the report, but the case is being taken over by the East Bay Regional Parks Police Department, Mazzone said.
Today's latest headlines | ABC7 News on your phone
Follow us on Twitter | Fan us on Facebook | Get our free widget