The hjortspring boat is a very old boat that was discovered in Denmark. The boat is very special because it was made a very long time ago, around the year 400 BC! That's even before your great-great-grandparents were born!
The boat is made out of oak wood and is about 19 feet long. It's called the hjortspring boat because it was found in a place called Hjortspring. Some people believe that the hjortspring boat was used for fishing or for travelling on rivers and lakes.
What's really cool about this boat is that it was made using a special technique called clinker construction. That means that the pieces of wood were placed one on top of the other, a bit like building a tower out of lego bricks. This made the boat very strong and able to stand up to the waves when it was on the water.
Even though the hjortspring boat is very old, scientists have been able to use some clever tricks to learn more about it. You know how sometimes you can take apart a toy to figure out how it works? Well, scientists did something like that with the hjortspring boat. They took a really detailed look at the wood and the markings on the boat to try to figure out how it was built.
Thanks to these investigations, we know a lot more about how people made boats a very long time ago. The hjortspring boat may be old, but it's still teaching us new things!