1. Doline means sinkhole, though whether there is a connection is unclear.2. The fig tree growing in the debris cone on the doline floor. 3. The doline was first recorded by a Athenian caving clubs. 4. He made illustrations for the magazines " Alejandro Doline . 5. It is believed to be a collapsed doline ( a type of sinkhole ). 6. Visitors can also view the part of the underground canyon with Big Collapse Doline ( ). 7. In karst areas, a sinkhole, sink, or doline is a closed depression draining underground. 8. The crater is a geological formation known as doline , formed by the collapse of huge boulders creating this cave. 9. The name " doline " comes from " dolina ", the Slovenian word for this very common feature. 10. On 2 April, General Metikoa along with the 6th Croatian Infantry Division attacked the Chetniks not far from Gornja Doline .