Sandi Bird Sanctuary is a freshwater marsh in the Hardoi district of Uttar Pradesh. The wetland is typical of the Indo-Gangetic plains and receives most of its water from monsoon rains. Rich in aquatic plants, the Site provides a productive habitat for waterfowl with over 40,000 individuals counted in 2018. It is home to over 1% of the South Asian populations of common teal (Anas crecca), red-crested pochard (Netta rufina) and ferruginous duck (Aythya nyroca), while the vulnerable sarus crane (Grus antigone) has a population of 200 individuals within the Sanctuary. The wetland is a popular recreational and tourism destination and supports surrounding farmers as a source of livestock fodder. Drought presents a threat; the Sanctuary dried out leading to a subsequent collapse in waterbird populations from 2014 to 2015.

A wetland should be considered internationally important if it contains a representative, rare, or unique example of a natural or near-natural wetland type found within the appropriate biogeographic region.

A wetland should be considered internationally important if it supports vulnerable, endangered, or critically endangered species or threatened ecological communities.

A wetland should be considered internationally important if it supports populations of plant and/or animal species important for maintaining the biological diversity of a particular biogeographic region.

A wetland should be considered internationally important if it supports plant and/or animal species at a critical stage in their life cycles, or provides refuge during adverse conditions.

A wetland should be considered internationally important if it regularly supports 20,000 or more waterbirds.

A wetland should be considered internationally important if it regularly supports 1% of the individuals in a population of one species or subspecies of waterbird.

A wetland should be considered internationally important if it supports a significant proportion of indigenous fish subspecies, species or families, life-history stages, species interactions and/or populations that are representative of wetland benefits and/or values and thereby contributes to global biological diversity.

A wetland should be considered internationally important if it is an important source of food for fishes, spawning ground, nursery and/or migration path on which fish stocks, either within the wetland or elsewhere, depend.

A wetland should be considered internationally important if it regularly supports 1% of the individuals in a population of one species or subspecies of wetland-dependent nonavian animal species.