Dividing rural and urban areas seems pointless, yet it is necessary in spatial planning. We used cognitive mapping to survey 25 inhabitants of Izola municipality. 68% of surveyed people perceive the bypass as the border between rural and urban areas. This opinion matches the municipality%s long-term spatial plan. Based on these findings and on recognized land use conflicts, we propose a possible border between rural and urban areas. It can be used in planning the future spatial development of municipality.