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.
Belakangan, saat rongga - rongga berkembang, bagian atas batu kapur ambruk, sehingga terlihatlah air di sumur - sumur dalam alami yang berwarna hijau dan biru, yang banyak di antaranya dikelilingi tumbuhan yang rindang.