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In 2011, the European Committee for Standardization (CEN) published EN13809:2003, providing a definition of the term “tourist guide” (“tour guide” in US English):
Tourist Guide is a Person who guides visitors in the language of their choice and interprets the cultural and natural heritage of an area, which person normally possesses an area-specific qualification usually issued and/or recognised by the appropriate authority.
Therefore, only qualified and licensed guides are allowed to interpret the cultural and natural heritage of an area.
Please bear in mind that all licensed guides should have a badge that looks like the one you see below. When you contact people on the internet that present themselves as “guides”, don’t hesitate to ask their credentials.