The city of Imotski, its lakes and the nature surrounding them are an exceptional combination of natural and historical heritage. The Red and the Blue Lake are among the most beautiful natural wanders. The deep lakes carved into stone formed gradually as karst slowly dissolved over the millennium. Imotski and its surroundings used to be covered by Downey Oak (Quercus pubescens) and Oriental Hornbeam (Carpinus orientalls) forests. The long-term human impact almost caused the forests to completely vanish. Due to international reforestation during the 20 th century “The Barren Karst” as well as the “Gaj” city park are now covered by a Black Pine forest. A tree nursery and arranged pathways gave Imotski another significant urban characteristic.