when i was about 5, I lived in Brazil and my family visited Iguazu Falls. my mom explained to me that down there (bottom of waterfall or something) was Paraguay, and over there (across the river or something) was Argentina, and where we are standing is Brazil. Somehow I concluded this means that Argentina, Paraguay, and Brazil were parallel plains/landscapes of separate altitudes. The three countries were stacked like floors in a building, overlapping. So most of Paraguay was uderground. So when someone said "Paraguay is below Brazil", meaning south, I would think "oh yeah, I've been there, I know what's going on".
A childhood belief about places

others believed things like this
- I used to believe that England was in the Moon.
I am from Brazil!Anon - I used to believe woman got preganant by looking at a cabbage.
JOrge - BRazil — JOrge Nilson - I used to think the girls' name "Tina" was short for "Argentina".— Kristen
- At the ocean's horizon there was a giant waterfall.— Stephanie
- I remember a girl in my kindergarten class told me she wanted to be a waterfall when she grew up.Anon
- I used to believe Sting was my dad in a parallel universe — Jenn Green