The Ecological Marine Units (EMU) map seeks to portray a systematic division and classification of physiographic and ecological information about features in the ocean. The project is a new undertaking of Esri in collaboration with Dr. Roger Sayre of the USGS, the Marine Conservation Institute, NatureServe, the University of Auckland, GRID-Arendal, NOAA, Duke University, the Woods Hole Oceanographic Institution, and many other partners.