Essential ecosystems are ecosystems outside conservation areas that are ecologically and socially, economically and culturally important for biodiversity conservation, while Essential Ecosystem Areas (KEE) are essential ecosystems that are designated as protected and protected areas managed based on conservation principles as which adopted in conservation forest management. KEE consists of land essential ecosystem wet and terrestrial. Ecosystem essential land wet is land ecosystem wet which main have uniqueness and/or function important from habitat and/or type biota water or working as region/path migration, or have population species bird water or biota water important other tall one. Terrestrial essential ecosystem is a land ecosystem in the form of forest and non-forest that has unique and/or species and types of ecosystems play a role as corridor animal wild and habitat important plant and animals wild or have population species land important other which high . Ecosystem essential is important managed because of its uniqueness, riches life in it and its relationship to the surrounding ecosystem. Building an essential landscape area must be carried out by many stakeholders such as government area, cross-ministerial, NGO, University and private sector. Management which is conducted by integrated especially aim for equalize view and perception to management ecosystem essential, synchronize programs in order to obtain optimal and sustainable benefits.
At the grassroots level, CAN supports the community to protect the forest with the concept of community patrol. CAN supports forest communities by establishing a Community Forest Ranger (CFR) which is formed in collaboration with villagers. Each member of the CFR has been trained to maintain, monitor and cooperate with law enforcement authorities to ensure that there are no threats that can damage protected forests or other high conservation value areas.