Conceptual scheme of the study and workflow of the data flow used to map the recreation ES (adapted from Zulian et al. 2013). The model diagram was designed in google drawings web application.

  
  Part of: Ihtimanski I, Nedkov S, Semerdzhieva L (2020) Mapping the natural heritage as a source of recreation services at national scale in Bulgaria. One Ecosystem 5: e54621. https://doi.org/10.3897/oneeco.5.e54621