The theory of post-conflict development of territories as an actual topic for Ukraine is studied. The methodology of research of the theory of post-conflict development of territories, which consists of applying the idea of geocybernetics and probabilism, is proposed. It is established that the post-conflict development of territories refers to large-scale General geographical issues, which will be addressed by representatives of many Sciences. Therefore, the study presents various points of view, which made it possible to form the author’s vision of post-conflict tourism development as a geographical system. A theoretical model of post-conflict tourism development as a system has been developed. It is established on the example of countries of the world that the Genesis of conflicts has a different character, but in the post-conflict period, similar results should be taken into account when overcoming the post-conflict situation in the Eastern territories. It is proposed to introduce a “model of post-conflict green development” in the old industrial Eastern territories of Ukraine, which should contain: effective use of regional potential; increasing the share of high-tech industrial sectors; the increasing role of services sector: business, tourist, recreation, social; improving the business climate and business activity; alternative energy development; ecological modernization of production and introduction of energy-saving technologies in production; change the behavior of economic actors; extensive landscaping; restructuring works at abandoned coal mines and other industrial plants; remediation of numerous waste heaps. The creation of a forest Park zone in the zone of the current confrontation in the Donbass, the organization of recreation places there in the future will contribute to the establishment of peaceful life, the establishment of ecological balance in the region, and overcoming existing problems of socio-economic development. It is proposed to use the “tourist and recreational” development path in these territories, which can become the first, least capital-intensive step in the future renewal of the East of Ukraine.