Identify and describe recreation opportunity classes or zones. Using marine protected areas as an example: Most marine settings of sufficient size contain a diversity of biophysical features, such as reefs, underwater cliffs, corals, beaches and evidence of human occupation and use. They may vary significantly in terms of the amount and type of development. Likewise, social conditions, such as level and type of use, and types of recreation experiences, vary from place to place. The type of management needed may vary throughout the area. Opportunity classes describe subdivisions or zones of the natural resource where different social, resource, or managerial conditions will be maintained. For example, deeper reef settings will require Scuba gear while in shallower areas snorkels may be adequate.