This paper analyses public use in the Ebro Delta Natural Park using PPGIS (public participation geographic information system) methodology. An online survey was designed using Google Maps API, HTML, and JAVASCRIPT. Respondents were asked to place and rate thirteen items on an interactive map to characterize and georeference public use with regard to accessibility, facilities and services, signposting, safety and security, and leisure activities. In total we collected 209 valid surveys and mapped 2617 georeferenced opinions. Facilities and services were rated highly by users (72.46% were "very satisfied"). These were followed by accessibility (61%, "very satisfied") and signposting (60.2%, "satisfied" or "quite satisfied"). Safety and security items were hardly rated perhaps because users do not feel insecure in the area. Respondents' mapping of opinions and experiences, which are heterogeneous and were well rated, enabled us to visualize areas that might be understood as social hotspots. Our results show that PPGIS is an effective procedure for measuring public use in protected areas and may be a valuable tool for park managers and planners. in order to understand and manage visitors' behaviour. Three main strategies help to adjust public use include direct regulation, directive measures, and indirect measures [9]. Direct regulation relies on policing, regulations, and force of law to educate visitors' behaviour. Directive measures guide visitors in desired directions or attitudes but do not impose or enforce behaviours. Indirect measures use information, interpretation, and other learning opportunities to raise visitor awareness while allowing them the freedom to act. A combination of these three types of measures is usually employed but managers tend to turn to direct regulation when the other two measures fail [9]. Visitors are not usually aware of these measures and do not need to be for them to succeed [5]. However, public use measures help managers to understand visitor behaviour and level of satisfaction and improve visitor experience [2]. Public use should therefore be monitored in order to assess the environmental and social impact of visitors, assess service quality, and evaluate visitors' needs and experiences [9].Public use can be monitored on a gradual scheme from simple situations to complex ones. A scheme by Reference [1] pinpoints five levels (from initial to advanced) that can be implemented as needs arise and require a range of effort to (1) collect, (2) summarise, (3) analyse, and (4) interpret data for management action. The public use approach is also summarized in eight programmes: welcoming, quality of facilities, environmental education, task monitoring and evaluation, finance, training, management and administration, public participation, health and safety, and research. Above all, proper public use is key to promoting sustainability and ensuring minimum social and environmental standards [3].Public use studies provide detailed information about visitor profiles, preferences, motivations,...