The coastal vegetation formation is in the southern and northern parts. The coastal forests of the south extend from the direction of Grajagan (Segoro Anak) to Plengkung with a stretch length of about 30 Km and Plengkung – Tanjung Slakah with a span length of about 50 Km. The types of plants that dominate coastal forest formations are Ketapang (Terminalia catapa), Sawo Kecik (Manilkara kauki), Waru Laut (Hisbiscus sp.), Keben (Baringtonia asiatica), and Nyamplung (Calopyllum inopyllum).
In general there are more than 700 types of plants that have been identified in the region and are divided into 123 families. Verbenaceae and Poaceae are the families with the highest number of species. When viewed based on the grouping of places to grow, lowland plants have the most types, followed by coastal plants, and mangrove plants.
In addition, so far recorded 63 species found Herpetofauna consisting of 15 types of amphibians and 48 species of reptiles. Alas Purwo is one of the important landing areas for four species of turtles, namely turtles (Lepidochelys olivaceae), green turtles (Chelonia Mydas), Hawksbill (Eretmochelys Imbricata), and leatherback turtles (Dermochelys coriaceae). The four types of turtles are found along the south coast from pancur to cungur located in the southern part of the area
According to the Schmidth and Ferguson classification system the area around Alas Purwo National Park has climate type around D (slightly moist) to E (slightly dry). Administratively Alas Purwo National Park area included in the area of Banyuwangi Regency so that for climate data obtained from Banyuwangi Meteorological Station.