From the tzompantli, a 300m rough stone road runs north (a five-minute walk) to the huge sunken well that gave this city its name. The Sacred Cenote is an awesome natural well, some 60m in diameter and 35m deep. The walls between the summit and the water's surface are ensnared in tangled vines and other vegetation. There are ruins of a small steam bath next to the cenote, as well as a modern drinks stand with toilets.