Park system

"[1] 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.

[2] In 1927, the Maryland-National Capital Park and Planning Commission was formed to plan and acquire parklands along stream valley corridors in the then-rural northern and eastern suburbs of Washington, D.C. Over 33,000 acres (130 km2) are now protected in the Montgomery County, Maryland portion and provide welcome green space in this urbanized region.

The largest continuous urban parks system in North America is the North Saskatchewan River valley parks system in Edmonton, Alberta, Canada, which is 7,400 ha (18,000 acres) in size and 48 km (30 mi) in length, and also includes 22 ravines, which have a combined total length of 103 km (64 mi).

[3] The largest urban parks system in Australia is the Western Sydney Parklands, which is 5,280 ha (13,000 acres) in size and 27 km (17 mi) in length.