Edited sentence: Political consensus in favor of road construction has not emerged.Roadbuilding through this area is expensive and the environmental cost is high.The Panamanian side, in sharp contrast, is a mountainous rainforest, with terrain reaching from  in the valley floors to  at the tallest peak (Cerro Tacarcuna, in the Serranía del Darién).The Serranía del Baudó range extends along Colombia's Pacific coast and extends into Panama.The conventional boundary between South America and North America is the Darién Gap watershed divide along the Colombia–Panama border where the South American continent meets North America in the Isthmus of Panama.The geography of the Darién Gap on the Colombian side is dominated primarily by the river delta of the Atrato River, which creates a flat marshland at least  wide.There is also a gap in the Pan-American Highway that begins in Turbo, Colombia and ends in Yaviza, Panama, and is 106 km (66 miles) long.This area encompasses a large watershed, forest and mountains in the northern portion of Colombia's Chocó Department and Panama's Darién Province