The North has for decades demanded that the USA formally declare the end of the 1950-53 conflict that was halted only with an armistice, saying an official end to the war would ease tensions on the flashpoint peninsula.
In 2015, two South Korean soldiers were maimed by what Seoul said was a North Korean landmine, an accusation the North denied.
The Associated Press reports that the South Korean and USA militaries have set one million to 1.2 million landmines south of the DMZ.
The South Korean Army estimated that it would take about 200 years to completely remove land mines buried in the DMZ, which is of a size equivalent to Yeouido, an 8.4-square-kilometer island near downtown Seoul.
South Korean President Moon Jae-in says recent military agreements will "end all hostile acts at the land, sea and sky between South and North Korea".
This image depicts South and North Korean troops participating in a landmine removal operation in the Demilitarized Zone.
All the landmines in the Joint Security Area - the only portion of the DMZ where forces stand face-to-face - are expected to be removed within 20 days. In the meantime, the two Koreas and the UN Command will discuss ways to disarm the zone such as by pulling out troops, weapons and guard posts.
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Mines dislodged by flooding and landslides have occasionally caused deaths in front-line areas in South Korea.
North Korea has warned Washington that a declaration ending the Korean War shouldn't be seen as a bargaining chip in denuclearization talks.
In the "Arrow Head Hill", where some of the fiercest battles during the Korean War happened, Seoul officials believe there are remains of about 300 South Korean and United Nations forces along with an unspecified number of Chinese and North Korean remains. About 2 million mines are believed to be peppered inside and near the DMZ, which is also guarded by hundreds of thousands of combat troops, barbed wire fences and tank traps on both sides.
Moon has advocated dialogue with the isolated North to nudge it toward denuclearisation.
Critics have anxious that Moon's recent inter-Korean military deals would weaken South Korea's war readiness because the North's nuclear program remains largely intact.
"The North is trying to reduce the negotiating value of Washington's potential offer of a peace treaty, by suggesting that "it's not good enough to make us denuclearize", he told South Korea's news agency Yonhap.
Many foreign experts say North Korea is likely running additional secret uranium-enrichment plants. Kim Jong Un has subsequently held a series of summits with U.S., South Korean and Chinese leaders and taken some steps like dismantling his nuclear-testing site.