The Sacred Cenote (American Spanish: Senote saˈɣɾaðo, "sacred well"; also known as the "Well of Sacrifices") is a water-filled cenote at the pre-Columbian Mayan archaeological site of Chichén Itzá in the northern Yucatán Peninsula. It is located north of the Chichen Itza civic district, to which it is connected by a 300-meter sacbe, or raised, paved path.
According to post-conquest sources (Mayan and Spanish), the pre-Columbian Maya sacrificed objects and humans in the cenote as a form of worship to the Mayan rain god, Chaac. Edward Herbert Thompson dredged the sacred Cenote, from 1904 to 1910, and recovered artifacts of gold, jade, pottery, and incense, as well as human remains. A study of human remains taken from the sacred Cenote revealed that they had wounds compatible with human sacrifice
taken from Wikipedia