The Finnish landscape is covered with thick pine forests and rolling hills, and complemented with a labyrinth of lakes and inlets. Commercial cruises between major coastal and port cities in the Baltic region, including Helsinki, Turku, Tallinn, Stockholm, and Travemünde, play a significant role. Finland is locally regarded as the home of Saint Nicholas or Santa Claus, living in the northern Lapland region. Above the Arctic Circle, in midwinter, there is a polar night, a period when the sun does not rise for days or weeks, or even months, and correspondingly, midnight sun in the summer, with no sunset even at midnight (for up to 73 consecutive days, at the northernmost point). Lapland is so far north that the Aurora Borealis, fluorescence in the high atmosphere due to solar wind, is seen regularly in the fall, winter, and spring. Outdoor activities range from Nordic skiing, golf, fishing, yachting, lake cruises, hiking, and kayaking, among many others.