The sea that acts like a lake

The Baltic Sea in northeast Europe is a peculiar body of water, combining the characteristics of a sea with those of a lake and an estuary, too. Strictly speaking, it is in fact a sea and thus appropriately named, joined to the Atlantic Ocean through three straits in Denmark: the Öresund, Great Belt, and Little Belt. Technically, the Baltic is classified as a brackish sea, meaning it is not entirely fresh and not entirely saline. The Baltic Sea isn't landlocked, but it does border many countries, including Russia, Finland, Sweden, Denmark, Germany, Poland, Lithuania, Latvia, and Estonia—and it's the Estonian coast featured in today's image.
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