Navigable aqueduct

A navigable aqueduct is like a really big water slide for boats, but instead of just sliding down, the water slide goes over land, like a bridge. This way, boats can go over land without having to stop and lift the boat out of the water and put it back in on the other side. It's like a road for boats, but over water or land. It's really cool, and people made it so that boats could get to places that they couldn't before.