Before being passed into national park, Alas Purwo was previously existed as wildlife of Banyuwangi. Based on the Decree of Dutch East Indies Governor No. 6 Stbl 456 dated September 1 ‘1939 with total area of 62,000 hectares. Then, converted into Alas Purwo National Park with an area of 43,420 hectares by Decree of Forestry Minister of Indonesia in 1992. Alas Purwo National Park mandated by Law No. 5 of 1990 on Conservation of Biological Resources and Ecosystems, has 3 main functions, namely:
- Support protection system of Ecological life.
- Preservation of diverse plants and animals and their ecosystems.
- Utilization of natural resources and ecosystems in form of research, science, education, cultivation support, and nature tourism.
Alas Purwo National Park is forest containing wide type variety and relatively intact ecosystems on Java Islands of. Ecosystems ranging from forests owned beaches to lowland rain forests, mangrove, plantation and savanna. Variety of ground flora species in Alas Purwo National Park is high. There are more than 700 species of plants, ranging from small plant to big plant various types of vegetation. Distinctive and endemic plants in the Park are small sapodilla (Manilkara kauki). In addition, common plant is ketapan (Terminalia catapa), nyamplung (Calophyllum inophyllum), bitterness (Barringtonia asiatica), bulging (Sterculia foetida), and 10 species of bamboes.