The Daejeon Southern Ring Expressway (Korean: 대전남부순환고속도로), Daejeon Nambu Sunhwan Expressway or Daejeon Southern Beltway is an expressway in South Korea, connecting Honam Expressway Branch (Expressway 251) to Gyeongbu Expressway (Expressway 1) in Daejeon.

Numbered 300, it covers a length of 20.8 kilometers.

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