Balkanid arch / National Museum of Natural History / Bulgaria Ivan Pandourski Institute of Zoology / /
IndustryTerm
paleokarstic systems / /
NaturalFeature
Devetashko Karstic Plateau / Neogene lake / Struma / Black sea / Thracian Lowland / Zemen Gorge / Veleka River / Maritsa / Devetashko Plateau / Struma Valley / Black Sea coast / Mesta / /
OperatingSystem
Genera / /
Organization
Bulgarian Tourist Union / Bulgarian Federation of Speleology / National Action / Bulgaria Ivan Pandourski Institute of Zoology / Ministry of Environment and Waters / Union of the Scientific Workers in Bulgaria / Bulgarian Academy of Sciences / /