CARs
Canadian Air Regulations state that you must fly within 100NM or a distance covered in 30 minutes of flight at the cruising speed filed in the flight plan (whichever is lesser) of a safe landing area unless a life raft is carried on board. If you're not carrying a life raft, I believe the regulations require you to maintain flight at an altitude and distance so that in the event of an engine failure you are able to glide to a safe landing area.