In November 2020, the Ministry of Environment, Forest and Climate Change (MoEFCC) declared it the first Ramsar site in Bihar.

Kanwar jheel, as it is locally called, is located 22 km north-west of Begusarai Town in Manjhaul.

It is a residual oxbow lake, formed due to meandering of Burhi Gandak[6] river, a tributary of Ganga, in the geological past.

The Wetland is an important stopover along the Central Asian Flyway, with 58 migratory waterbirds using it to rest and refuel.

Mangifera indica, Annona squamosa, Polyalthia longifolia, Borassus flabellifer, Cocos nucifera, Phoenix sylvestris, Haplophragma adenophyllum, Bombax ceiba, Ceiba pentandra, Cordia dichotoma, Ehretia laevis, Bauhinia variegata, Cassia fistula, Delonix regia, Peltophorum pterocarpum, Tamarindus indica, Trema oriental, Terminalia arjuna, Diospyros Montana, Croton roxburghii, Trevia nudiflora, Dalbergia sissoo, Leucaena leucocephala, Pongamia glabra, Phoebe lanceolata, Azadirachta indica, Melia azedarach, Swietenia macrophylla, Acacia catechu, Acacia nilotica, Albizia lebbeck, Pithecellobium dulce, Artocarpus heterophyllus, Artocarpus lacucha, Ficus benghalensis, Ficus hispida, Ficus racemosa, Ficus religiosa, Ficus virens, Streblus asper, Moringa oleifera, Eucalyptus tereticornis, Psidium guajava, Syzygium cumini, Nyctanthes arbor-tristis, Phyllanthus emblica, Bambusa bambos, Dendrocalamus strictus, Ziziphus mauritiana, Anthocephalus kadamba, Aegle marmelos, Citrus maxima, Madhuca indica, Tectona grandis