Spatial areas containing a combination of biotic and abiotic components and other characteristics that function together. They contain a specific combination of ecosystem characteristics (e.g., a tropical rain forest) or areas that contain a variety of combinations of ecosystem characteristics (e.g., a river basin containing wetlands, agriculture and settlements). However, these assets are distinguished from the various individual components that are contained within a spatial area; and from other ecosystem characteristics (e.g. biodiversity, resilience).