In trying to influence spatial development, people engage in discussions about distinctions between places or areas, and the roles of government and society, while they need to relate to other groups of stakeholders. In other words, boundaries (between meanings of places, between government and society, and between different groups of people) are omnipresent in spatial governance. Does the peri-urban area belong to the city or to the countryside? Can nature be integrated into farming? What should be the role of governments in relation to bottom-up initiatives? And how can people collaborate in spite of their differences in background, culture and knowledge? People have devised various tools and strategies to deal with boundaries. This study investigates those boundary arrangements in practices of spatial governance, such as boundary concepts, boundary organisations and social learning. They are often combined for a more effective boundary management, because as a rule multiple boundaries are relevant.