Later, where cavities had developed, the top portion of the limestone collapsed, leaving the water exposed in deep natural wells of green and blue, many of which are surrounded by luxuriant vegetation.
Ar laiku vietās, kur bija izveidojušies dobumi, kaļķakmens augšējais slānis iegruva, veidodams ar zaļu vai zilu ūdeni piepildītas dabiskas akas, kurām apkārt bieži vien zaļo bagātīga augu valsts.