Ecoregions of the world, spanning all land area (terrestrial) of the planet, were first defined and mapped in 2001[ 1] and subsequently revised in 2017.[ 2] Later, freshwater ecoregions [ 3] and marine ecoregions [ 4] of the world were identified. Within India , there are 46 terrestrial ecoregions, 14 freshwater ecoregions, and 6 marine ecoregions.
^ Olson, David M.; Dinerstein, Eric; Wikramanayake, Eric D.; Burgess, Neil D.; Powell, George V. N.; Underwood, Emma C.; D'amico, Jennifer A.; Itoua, Illanga; Strand, Holly E.; Morrison, John C.; Loucks, Colby J. (2001-11-01). "Terrestrial Ecoregions of the World: A New Map of Life on Earth: A new global map of terrestrial ecoregions provides an innovative tool for conserving biodiversity" . BioScience . 51 (11): 933–938. doi :10.1641/0006-3568(2001)051[0933:TEOTWA]2.0.CO;2 . ISSN 0006-3568 . S2CID 26844434 .
^ Dinerstein, Eric; Olson, David; Joshi, Anup; Vynne, Carly; Burgess, Neil D.; Wikramanayake, Eric; Hahn, Nathan; Palminteri, Suzanne; Hedao, Prashant; Noss, Reed; Hansen, Matt (2017-06-01). "An Ecoregion-Based Approach to Protecting Half the Terrestrial Realm" . BioScience . 67 (6): 534–545. doi :10.1093/biosci/bix014 . ISSN 0006-3568 . PMC 5451287 . PMID 28608869 .
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