By most accounts, Portugal's counterinsurgency campaign in Angola was the most successful of all its campaigns in the Colonial War. Angola is a large territory, and the long distances from safe havens in neighboring countries supporting the rebel forces made it difficult for the latter to escape detection. The distance from the major Angolan urban centers to the neighboring Democratic Republic of the Congo and Zambia were so large that the eastern part of Angola's territory was known by the Portuguese as "Terras do Fim do Mundo" (the lands of the far side of the world).