Current predictions highlight major climate-related impacts on coastal cities around the world. At the same time, wetlands provide important services and habitats for both natural and anthropogenic activities and could play an important role in mitigating these impacts in coastal areas. However, due to the increasing population and associated urban growth, endemic coastal wetlands are still being reclaimed for urban development. Approaches balancing urban and wetland functions and needs could, therefore, play a key role in the future sustainable development of both the urban and natural environments. Based on a systematic literature review, this chapter maps urban-wetland interactions by combining key principles derived from state-of-the-art theoretical descriptions of urban-ecosystem relationships in urban design with site-specific wetland functions and design strategies. State-of-the-art theoretical urban frameworks that define sustainable urban-ecological relationships are used to identify key underlying principles which are further compared to assess overlaps and differences. To connect theoretical principles to practical context-dependant functions and design strategies, coastal wetland functions are analysed and categorized in relation to the identified theoretical framework characteristics. Theoretical principles and practical design strategies are then combined using a visual system thinking concept map, to provide a map of urban-wetland systems and relationships.