Or the "No Wake Zone", although I would suspect the aircraft are kicking up more waves than that canoe. Or if they are in Minnesota they are just coming by to ask if they are catching anything...
In the US, we seem to do around 200-500 feet; the Israeli's from a brief HUD footage on a documentary on the attack on Osirak seem to do around 50-150 feet; then the British, French, and Swedes come in below them at 30-50'.
...one more...On Quora someone asked, "What's the lowest a plane can fly?"
This picture came with accompanying response of, "Frank Tallman & Paul Mantz got fairly low for this scene from 'The War Lover' - looks like 15 feet to me"...