File:Skärgårdshavet.png · Wikimedia Commons · See Wikimedia Commons
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Encyclopedic overview
The Baltic Sea with the Archipelago Sea marked in red. Most of the islands are not visible at this resolution. 8,300 square kilometres
The Archipelago Sea (Swedish: Skärgårdshavet, Finnish: Saaristomeri) is a part of the Baltic Sea between the Gulf of Bothnia, the Gulf of Finland and the Sea of Åland, within Finnish territorial waters. By some definitions it contains the largest archipelago in the world by the number of islands, estimated at around 50,000, although many of the islands are very small and tightly clustered.
Excerpted from Wikipedia’s “Archipelago Sea” article, available under the CC BY-SA 4.0 licence.