This book deals with both parts (Bulgarian and Greek) of the Eastern Rhodope Mountains. It consists of three articles on the flora (1962 species of higher plants) and 45 articles on the fauna (4329 animal species, both vertebrates and invertebrates). The volume also contains zoogeographical analysis of each group, data about relicts, endemics and sites of importance for conservation. The huge amount of information is provided by more than 56 authors.