This paper focuses on the recent development of ecotourism. Ecotourism is a major regional activity, aiming at economic development amid better environmental circumstances. However, the principles regarding the promotion of ecotourism are not common among different researches, and this has led to some confusion regarding definitions. It is necessary for a rigorous definition and the principles of ecotourism to be applied to regional development from a common-pool perspective. Moreover, we intend to provide some case studies pertaining to regions implementing ecotourism and mention the policy implications regarding ecotourism-based management.