The Mannahatta Project is a Wildlife Conservation Society research project in historical ecology led by landscape ecologist Eric W. Sanderson[1] that principally ran for 10 years from 1999-2009, reconstructing the island at the point of first contact between the Dutch ship Halve Maen and the Lenape in 1609. The work culminated in the publication of Mannahatta: A Natural History of New York City in 2009 and has subsequently developed as the Welikia Project and in influence on other environmental initiatives.