Capital cities stand out as one of the symbol cities of the countries with characteristic features, especially their historical and cultural values. Capitals, which enter the process of development and transformation while becoming symbol cities, witness numerous morphological changes. The historical past of Turkey’s capital Ankara, a Roman city before an Anatolian town, shows the region’s significance and indicates the existence of areas with urban traces. In this context, fringe belts, which bear historical traces, are crucial for sustaining Ankara’s urban values and need to be examined. This study aims to investigate the formation and transformation of the fringe belts of Ankara on winner projects from the Planning Competitions, which were held in different time periods after the declaration of the republic. The main question is how Ankara’s fringe belts have changed in line with these urban plans. Within the scope of the study, the historical city map and urban plans were analysed starting from 1924. In the study method, maps and plans were overlapped in the QGIS program to examine the fringe belts’ spatial change. It has been concluded that robust strategies have yet to be developed for fringe belt protections by evaluating the plans’ decisions and results. Fringe belts have disappeared in some areas, while others have changed their character due to the urbanisation pressure. Moreover, fringe belts that have survived thus far are in danger of extinction. This study provides a better grasp of the importance of Ankara’s fringe belts and contributes to the fringe belts’ protection.