In the northern peninsula the elevation is sufficiently low that the ancient Maya were able to reach the water table at deep sinkholes called cenotes, or at deep caves.
在半岛北部，海拔足够低，因此古玛雅人能够经由被称为竖井的深层排水口或深洞探及地下水位。
2
The Murge area in southern Italy also has numerous sinkholes.
意大利南部的穆尔杰地区也有许多天坑。
3
More than 2,500 sinkholes now line the shores of the Dead Sea.