Mexico · Geography · Hard
Answer: Sotano — A sotano (basement) is a vertical shaft cenote; El Zacaton in Tamaulipas is the deepest known water-filled sinkhole in the world at over 339 metres.
A sotano (basement) is a vertical shaft cenote; El Zacaton in Tamaulipas is the deepest known water-filled sinkhole in the world at over 339 metres.