Healthy Harbors are important for both the communities that surround them and the animals that live in them. Urban waterfronts, including harbors and ports, are a defining feature of coastal cities and serve as gateways to the rest of the world. HPL's Judy O'Neil co-edited a special issue of Regional Studies of Marine Science by the World Harbours Project, which featured several papers by UMCES researchers on harbors around the globe, from Guanabara Bay adjacent to Rio de Janeiro (Brazil) where urban development continues to degrade water quality and ecosystem health to Boston Harbor’s transformation from the “harbor of shame” to a vibrant coastal resource.