The Seoul Ring Expressway (Expressway No.100)(Korean: 서울외곽순환고속도로, Seoul Oegwak Sunhwan Gosok Doro) is a circular beltway or ring road around Seoul, South Korea. It connects satellite cities around Seoul, Ilsan, Namyangju, Hanam, Pyeongchon, Jungdong, Bundang, Pangyo, Sanbon and Gimpo. The freeway runs 127.6 km and has been completed. (source:WIKIPEDIA)