Researching episode

Hi, I was talking about old cartoons with my bf the other day, and I remembered this cartoon. I'm 23 and I remember 1 episode very vaguely. I was very very young and I still remember the weird feeling I had while watching it. It was about a tree and the moon reflecting on the river... and it made the tree bend .. lol..please if someone knows something about it, let me know xD I want to rewatch it 1 day