If you define an island (and not just a rock) to be a piece of land that's at least 100 square meters (or about 1000 square feet), then there are about 81,000 islands in the Finland archipelago. We sailed across it, first reaching the city of Mariehamn in Åland. The Åland archipelago has its own identity. It's officially part of Finland, but many of the residents speak only Swedish. Its currency is the euro, like Finland's, but you can't use Finnish postage stamps to send a letter there.