We present a web application for visualizing geographical data. The purpose of it was to create a tool that would enable non-experts to load and visualize geographical data. We describe the principles of data visualization and present common approaches of capturing and visualizing data. Our presentation framework is developed as a web application. We describe technologies we used, architecture of the application, interactions between the application components, and the user interface. We demonstrate the use of the application through examples based on geographical data of Slovenian municipalities and statistical data of income distribution and unemployment.