+The [Arctic Circle](/wiki/arctic_circle) is a significant line of [latitude](/wiki/latitude) defining the southernmost extent where the sun remains visible for 24 continuous hours at least once a year. North of this boundary, the phenomenon of the [midnight sun](/wiki/midnight_sun) occurs in summer, balanced by polar night in winter.
+## See also
+- [Antarctic Circle](/wiki/antarctic_circle)
+- [Polar Region](/wiki/polar_region)
+- [Arctic](/wiki/arctic)
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