Rural land area below 5m is the total rural land area in square kilometers where the elevation is 5 meters or less.
Center for International Earth Science Information Network (CIESIN)/Université Columbia. 2013. Urban-Rural Population and Land Area Estimates Version 2, Palisades, New York : NASA Socioeconomic Data and Applications Center (SEDAC). http://sedac.ciesin.columbia.edu/data/set/lecz-urban-rural-population-land-area-estimates-v2.