The United Nations said on Thursday Nigeria risked prolonging a border dispute with Cameroon by trying to miss out one contested village as experts attempt to demarcate the frontier. A U.N.-led joint commission chaired by the world body's special envoy to West Africa, Ahmedou Ould-Abdallah, was set up in 2002 to define the land boundary between the two countries following a ruling by the International Court of Justice (ICJ). Field experts from Nigeria, Cameroon and the United Nations started last week to verify the boundary, drawn up by cartographers in New York, on the ground but encountered problems when they came to the border village of Koja. "Regrettably, soon after the start of the field assessment, the joint technical team was informed of Nigeria's decision to skip verification of the boundary line in the village of Koja," Ould-Abdallah said in a statement. "This decision could have the effect of holding up the entire demarcation process," he said. --More 2313 Local Time 2013 GMT