I was just old enough to ride my bicycle around our Seattle Neighborhood in the Northwestern US. My understanding of geography was such that Washington, was just south of Canada. With this in mind, I set out one day to bike to Canada. Some six to eight blocks north of our house I asked a lady doing yardwork, "Is this Canada?" "No. You have a ways to go yet." she replied.
So maybe it was a 120 miles, give or take, but then I couldn't have told you how far a mile was either.
A childhood belief about places

others believed things like this
- I used to believe all of North America was Canada and South America was USA..— Daria
- I used to believe that The Mall Of America was in Canada. — Adam
- I used to believe that Canada was a territory of the U.S. and was one big forest.Anon
- When I was a child I always thought Canada was apart of the US... not its own country!! — clueless youngster
- Living near Canada's border without cable, I didn't know I was American. — Romania
- The buckinghams song "kind of a drag", i always thought they were singing, "Canada Dry"— bobbybobby