South of Harvard Avenue, the Cuyahoga Valley narrows and still retains a largely natural land cover. Although industrial giants such as Alcoa, the former American Steel and Wire, and British Petroleum are still located here, industrial development within this segment is not as intense, and there are many properties which have not been developed and covered with buildings. Access is more difficult than in other parts of the Valley. The extensive natural areas of this district were capitalized upon and protected with the 330-acre Ohio and Erie Canal Reservation's establishment, a natural oasis in the middle of the nation's 25th most populous county.