The government and the country's biggest rebel force, the Revolutionary Armed Forces of Colombia (FARC), laid the groundwork for a full peace deal when they signed a definitive ceasefire in June.
That deal will be followed by a full peace accord only if the agreement is approved in a referendum in the coming months.
"We need the mission to deploy as quickly as possible," Sergio Jaramillo, Colombia's high commissioner for peace, told reporters yesterday.
The first group of observers, of which there will eventually be 450, primarily from Latin America, has arrived in Colombia to verify the disarmament and monitor the ceasefire.
"From what I understand, at the latest in three or four weeks they should be able to be there in full force," Jaramillo said.
Their recruitment "took a bit of time to get going but now the numbers seem to be there," he added.
After the UN's onsite visit last week, the international organisation and Bogota "have a much better idea of what happens on the ground," Jaramillo said
Ban confirmed that the UN mission will have about 450 observers, in addition to some civilian staff.
The mission will operate in 40 "widely dispersed locations," he said.
The ceasefire will be monitored by a three-party body manned by the government, FARC and the UN.
Ban's report highlighted the "positive reaction of the civilian population" and said conditions "show that preparations are on track not only from a technical viewpoint but also from a political perspective."
"Important issues remain on the table" in Havana, where the talks were held, the UN chief said.
The sustainability of the peace agreement depends on "the implementation of a reliable program of reintegration of the FARC-EP combatants," he said.
The government and the Marxist rebels are still in the final phase of four years of peace talks aimed at ending more than half a century of conflict.
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