The Kalasasaya (kala for stone; saya or sayasta for standing up) or Stopped Stones is a major archaeological structure that is part of Tiwanaku, an ancient archeological complex in the Andes of western Bolivia that is designated as a UNESCO World Heritage Site.

The Kalasasaya is a low platform mound with a large courtyard, which is surrounded by high stone walls. The Kalasasaya is about 120 by 130 meters in dimension and aligned to the cardinal directions. Like the other platform mounds within Tiwanaka, it has a central sunken court. This sunken court can be reached by a monumental staircase through an opening in its eastern wall. The walls are composed of sandstone pillars that alternated with sections of smaller blocks of Ashlar masonry and incorporates tenon heads of many different styles. This wall has been reconstructed in modern times.

The Kalasasaya dates to at least 200 BCE - 200 CE. It is located to the north of the Akapana and west of the Semi-Subterranean Temple, other structures in the complex.


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