Korean Peninsula at night, satellite image. North is at top. The illuminations mark heavily populated areas with a high intensity of light emissions. South Korea has a high-density urban population, with the capital city of Seoul particularly prominent at centre. This contrasts markedly with North Korea (above South Korea), which has power shortages and frequent blackouts. The line of light on the border is the Korean Demilitarized Zone. The dot of light seen within North Korea, near its western coast, is the capital city of Pyongyang. At upper left are the lights of cities in China, and at bottom right the lights of cities on the southern islands of Japan.