What is "qullqa"

A qullqa ( "deposit, storehouse"; other spelling variants: colca, collca, qolca, qollca) is a storage structure found along the roads of the Inca Empire's road system. Qullqa is a silo that produced for store foods that collected as tribute. It is not only a granary where grains were stored, but also an underground cavern that mallkis stored. Qullqas are distinct from the tampu, the tampu was meant for more than storage. There are many more qullqas than tampus.