This layer depicts the locations of over 900 sites of potential environmental concern within the Yukon, including sites with known or suspected contamination; sites with physical hazards such as old adits, abandoned headframes and buildings; and sites with aesthetic concerns such as abandoned vehicles and debris. This layer includes all sites from a more detailed database maintained by the Environmental Programs Branch, Yukon Department of Environment.

The map service incorporates submarine slides. Slides are presented as polygons in addition to boundaries of the slides. The data has been compiled from several sources, with differing details. The main source for the slides on the Norwegian continental shelf is the Seabed project (Norwegian Deepwater Programme, Seabed project Phase II. Mid-to Late Cenozoic Geomodel of the Mid-Norwegian Continental Margin. Atlas volume (Report no. SP2-02-FS-01R-00003-04); By Fugro Survey Ltd., BGS, NGU). For slides in the other countries, the COSTA project (COSTA - Continental Slope Stability, 2004. Ed. J. Mienert. Marine Geology 213, 1-4, pp. 1-504) is the main source. Minor sources include various scientific publications and the Norwegian MAREANO project. Source information is available through the info button in the map service.