Earthen Fortification in Pungnap-dong, Seoul () is a flat earthen wall built at the edge of the Han River in Korea. It has a circumference of 3.5 km. It is located in modern-day Pungnap-dong,

Songpa-gu Songpa-gu (Hangul: 송파구) is a ''district'' of Seoul, South Korea. Previously known as Wiryeseong, the first capital of the kingdom of Baekje, Songpa is located in the southeastern part of Seoul, the capital city of South Korea. With rou ...

Seoul Seoul (; ; ), officially known as the Seoul Special City, is the capital and largest metropolis of South Korea.Before 1972, Seoul was the ''de jure'' capital of the Democratic People's Republic of Korea (North Korea) as stated iArticle 103 of ...

. It used to be included in the neighboring city of Gwangju. It has a long oval shape, spreading to north and south, and leaning slightly toward the east. Based on research conducted during the Japanese occupation, it has been speculated that Pungnap Toseong was Hanam

Wiryeseong Wiryeseong was the name of two early capitals of Baekje, one of the Three Kingdoms of Korea. Both are believed to have been in the modern-day Seoul area. According to ''Samguk Sagi'' (the oldest surviving Korean history book, written in the 12th ...

, the first capital of

Baekje Baekje or Paekche (, ) was a Korean kingdom located in southwestern Korea from 18 BC to 660 AD. It was one of the Three Kingdoms of Korea, together with Goguryeo and Silla. Baekje was founded by Onjo, the third son of Goguryeo's founder Jum ...

. Only 2.7 km of its walls remain. Including the west wall, which had been destroyed by flooding, its circumference reaches about 3.5 km and its area nearly 859,508 m². After constructing this central part, the inner wall, mainly composed of sandy soil, grit, clayish soil and muddy soil, was set up by heaping earth at a slant. On the top of the last earthen layer of the inner wall, pebbles were laid in three layers and trimmed stones were piled up inside 1.5m high with mud prepared from natural soil, and by piling up the central part in trapezoid shape whose lower part is 7m wide and 5m high.

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