Yale University holds an extensive amount of land, including two large forests and a natural preserve in and around Guilford, Connecticut, that contain most ecosystems of the Northeastern United States. These natural lands are open to professors and students for short-term and long term research. The following is a database that contains information about each natural holding, including history, past and present ecological research, species lists, contact information, and facilities information. For information concerning each site, including directions, detailed maps, that is not listed on the website, as well as information on how to apply for research permissions, contact the Yale faculty or staff member listed for each land holding.