Water covered in sea smoke.
In Stockholm between Kungsholmen to the north and Södermalm to the south, resides a bay named Riddarfjärden in English its known as The Knight Firth. West of Riddarfjärden is Marieberg and Långholmen. To the east the islands of Gamla Stan and Riddarholmen. When cold air blows over warmer water it evaporates and forms fog. This phenomenon is called sea smoke. A typical situation is when a not to strong wind is blowing from snow covered ground out over open water.