Ecotourism is linked to natural environments, while sustainable tourism is a broader concept, you can also make a metropolis sustainable tourism.
Ecotourism is naturalistic tourism practiced according to the principles of sustainable tourism. Differences between sustainable tourism and ecotourism. If you are hiking in the mountains and do not adopt sustainable behaviors, you are simply doing nature tourism. The term Ecotourism is overused and the concept of naturalistic tourism prevails over the principles of sustainable tourism that should be part of Ecotourism, just go to social media to see that the word ecotourism is erroneously associated with any activity in nature (even by insiders, such as tour operators and environmental guides). Result? Those who do tourism in nature often think of sustainable tourism only because they are in a natural context.