A park system, also known as an open space system, is a network of parks and other green spaces that are connected by public walkways, bridleways or cycleways. The concept first emerged with the need to minimize fragmentation of natural environments and was referred to as "patch and corridor." In modern landscape architecture, the park system is collaborating with the idea of planning greenways, which run through urban and rural areas. These systems can serve the landscape through ecological, recreational, social, cultural, and healthful measures, and are designed with intentions of sustainability.