Activities and sightseeing near Komarna in South Dalmatia
Two of the world's largest sink holes are close to Imotski in Croatia
Names in Croatian are: Modro Jezero (blue lake) and Crveno Jezero (red lake)
Both lakes are very close to Imotski. From Komarna you can choose two roads.
In both cases drive towards the city center when you arrive at Imotski and you will see plenty of signs directing you to the lakes.
The Blue Lake is a deep sinkhole formed by the collapse of the roof over a huge underground cave. The cave was formed by water through millions of years, and it collapsed about 5 million years ago. Erosion and earth quakes
have formed the sides of the lake so it is now possible to walk on a path all the way down the 220 meter deep sides.
Water depth in the lake varies a lot by season as it is fed by several small streams coming out of caves in the high walls of the lake. In August the lake may completely disappear if there has been no rain fall.
From the Blue Lake there is a short 1 km. walk to the Red Lake. The lake is named after the red cliffs that form its walls. The total depth of this hole is 522 meters, and it drains out in a strong underground river of unknown origin and destination. The lake was formed by the collapse of a huge cave millions of years ago. In the lake lives a fish that is unique. It was named Delminichthys adspersus as late as 1843 and it is a small sardine looking fish of 9 to 12 cm. The fish can occasionally be found in the Trebisat river and in the rivers and stream of the flat land below Imotski, and it suggests that there is wide spread underground connections between the rivers.
Above the town and the Blue Lake towers Fort Topana built by a
Croatian duke in the 9th century. It played an important part in the
Ottoman occupation from 1493 to 1717. Since the Turks left it lost its
importance and was abandoned more than 100 years ago
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