The paper focuses on the application of Geographical Information Systems (GIS) in the Kingdom of Saudi Arabia to combat terrorist activities. Even though the Internet became a tool of mass destruction, upgraded information systems can help in understanding the landscape where the presence of terrorists is suspected. Thus, GIS can help in crime mapping and countering terrorism. Different tools and methods related to GIS technology are discussed here and their applications in ensuring effective security measures are focused upon. GIS provides the technology that enables geographical data collection from LIDAR, aerial photography and satellite imagery, data that is captured, stored, analysed and displayed in maps. The maps can reflect hot-spot gas field and oil field where terrorist activities are carried out. This also makes geography a key subject in understanding such activities. Apart from terrorism, the public health sector also has a huge application for GIS. Such technological method requires effective mapping and when combined with geospatial technologies, terrorism can be countered with appropriate action. The age of big data, digital mapping and other remote sensing technologies are discussed in the paper.