the mediterranean region of bosnia and herzegovina which presents the adriatic mediterranean sea basin is composed of neretva trebisnjica and cetina river basins and of the narrow coastal zone around neum municipality neretva and trebisnjica river basins have an area of km or per cent of the total adriatic sea catchment area while cetina river basin in bosnia and herzegovina has an area of km or per cent of the total adriatic sea catchment area the eastern adriatic sea including its bosnia and herzegovina part is a shallow transitive area with a great number of typical pelagic and benthic species adapted to the high salinity