What is "cisterns"

Usage examples of "cisterns".

They made countless decisions and judgments, from the matter of whether the water cisterns should be repaired before Aelintide to the fate of a runaway serf who had committed adultery with the wife of someone in the village.

And if you know where to search, there are cisterns and caches of Makuraner bread baked hard as rock to keep forever.

I know other passages and stairs that connect it with other cisterns and other tunnels, so that even if we can't reach the Neorion we can walk underground to the Prosphorion.