Within Areas and Locations articles are classified either because of the main land use (rural, urban, protected, etc.) of the coastal or marine area that the article is referring to, or because of its location/s in the world. The United Nations Regional Sea categorisation has been used to indicate coastal and marine locations.
For example, supposing your article is about a case study on how a regional government is managing the loss of coral reefs and related social and economic issues, due to dynamite fishing in the South Pacific.
This article could be categorised as “South Pacific” and “Rural coastal area”