Baltoscandia is a name given to a region in Europe that is made up of a few countries. It includes countries such as Sweden, Norway, Finland, Estonia, Latvia, and Lithuania. It's like a big group of friends who live close to each other and share a lot of things in common.
These countries are sometimes called the Baltic states because they all have access to the Baltic Sea, which is a big body of water on the coast of northern Europe. This means they can all easily trade with each other by boat, which is really handy!
They all have a lot of similarities in their culture and history, like how they all have cold weather and lots of forests. They also have a similar language called the Baltic-Finnic language family.
Overall, Baltoscandia is like a group of close neighbors who all have a lot in common and get along well with each other.