Cute Young Blonde Girl Standing By The Pond With Trees

Uses
In the Indian subcontinent, Hindu temples usually have a pond nearby so that pilgrims can take baths. These ponds are considered sacred. In medieval times in Europe, it was typical for many monastery and castles (small, partly self-sufficient communities) to have fish ponds. These are still common in Europe and in East Asia (notably Japan), where koi may be kept.
Another use is in agriculture. In agriculture, treatment ponds combined with irrigation reservoirs are used as a self-purifying irrigation reservoir to allow irrigation at times of drought.