The following is a list of properties managed by The Trustees of Reservations (TTOR), a non-profit land conservation and historic preservation organization dedicated to preserving natural and historical places in the Commonwealth of Massachusetts. The Trustees are the oldest regional land trust in the world. The Trustees of Reservations own title to over 100 properties on 25,000 acres (10,000 ha) in Massachusetts, all of which are open to the public; it maintains conservation restrictions on 200 more properties.