Mongchontoseong (Korean: 서울 몽촌토성) is an ancient earthen rampart dating from the Baekje period.

The fortification walls are estimated to have been about 2.7 km (1.7 mi) in length and approximately 6 to 7 m (20 to 23 ft) high.

The fortifications of Mongchontoseong had a palisade atop the wall and a moat surrounding its base.

[citation needed] A number of important excavations of the site were conducted prior to the construction of the nearby Olympic Park.

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