Open-source data are data that are free, available to everyone, and can be used for various purposes. Open- source data can be found in various branches of activity, such as data from the field of environmental protection (water or air quality), data about individual players in sports (their performance) or about life (such as mapped interactive trails for mountaineers). It is very important to point out that open-source data increases transparency and helps strengthen public action in environmental protection. Thus, with their help, it is possible to analyze the origin of waste, the characteristics of waste and calculate area and some natural objects that are contaminated by waste. One of the tools that greatly helps us in the analysis and interpretation of open-source data is the Geographical Information System (GIS). There are several different ways of entering data into GIS software, such as tabular data, data uploaded via the WMS service, and data obtained by digitization from existing maps. This paper presents an example of the use of open-source data in the area of Ivanščica. After the analysis of open-source data, it is clearly visible that the area of Ivanščica is a natural area and that anthropogenic activity has not yet threatened the quality of the environment so far. The activities that lie ahead for the further protection of that mountain area will ensure that it remains so. Open-source data can only help in this