A flat-bottomed boat is a kind of boat that has a flat bottom rather than a curved one. Imagine taking a piece of paper and folding up the sides to make a little boat - that's basically what a flat-bottomed boat looks like. The bottom of the boat is flat and smooth, which means it can float really easily in shallow water without getting stuck. This type of boat is often used for things like fishing, because it can get into shallow parts of lakes and rivers where other boats can't go. It's also really stable and can hold a lot of weight without tipping over. Think of it like a big bathtub with a flat bottom - it's sturdy and perfect for staying close to the shore.