An inland harbor is like a very big bathtub that is used for boats to come and go. Instead of being by the ocean, it is in a big lake, river or canal. Boats can dock there to unload and reload things like cargo and people. Just like how we have a playground with toys and games, the inland harbor has special equipment like cranes and forklifts to help move things from the boat to the land. It's like the place where the toys for the playground are stored, but for boats. People who work at the harbor make sure everything is safe and in order, like playground monitors. That's what an inland harbor is all about!