These guidelines were prepared to provide advice on identifying and reporting OECMs in marine, freshwater, and terrestrial environments. They have been designed for application at various scales, from understanding whether or not a site is an OECM, to reporting OECM statistics at national levels. The intended audience for this document are governments, United Nations entities, private entities, NGOs, Indigenous organizations, local communities, and other stakeholders involved in conservation work and the pursuit of Aichi Target 11. Key sections include a Glossary of Terms (pg. 8), Recognizing OECMs – Definition and Characteristics (pg. 11), and Monitoring and Reporting OECMs (pg. 22).