Korea has eight metropolitan cities — major urban districts independent from provincial control. Of those, six operate subway (metro) systems.
Seoul and Busan and hold the largest two subway systems. Their below-ground and above-ground network extend beyond their city limits.
Seoul’s metro system runs 23 lines that blanket Seoul and reach deep into Gyeonggi (경기도; map), the province that surrounds the capital. Busan’s trains connect its sprawling districts and outlying cities.
Smaller metropolitan cities have fewer subway lines. Daegu has three lines. Incheon claims two. And both Daejeon and Gwangju have only one line.
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