The Pioneer Valley is the colloquial and promotional name for the portion of the Connecticut River Valley that is in Massachusetts in the United States. It is generally taken to comprise the three counties of Hampden, Hampshire, and Franklin. The lower Pioneer Valley corresponds to the Springfield, Massachusetts metropolitan area, the region's urban center, and the seat of Hampden County. The upper Pioneer Valley region includes the smaller cities of Northampton and Greenfield, the county seats of Hampshire and Franklin counties, respectively. Historically the northern part of the Valley was an agricultural region, known for growing Connecticut shade tobacco and other specialty crops like Hadley asparagus; however, since the late 19th century its economy has become increasingly a knowledge economy, due to the prominence of the Five Colleges in Hampshire County. Similarly the Springfield-Chicopee-Holyoke economies transformed from volume producers of goods such as paper and armaments, into a combination of specialized manufacturing and distribution services for Boston and New York City. Many of the cities and towns include areas of forests, and Springfield itself, which in the early twentieth century was nicknamed "The City in a Forest," features nature within its city limits and over 12% parkland. The Pioneer Valley is known for its scenery and as a vacation destination. The Holyoke Range, Mount Tom Range, and numerous rolling hills, bluffs, and meadows feature extravagant homes from the Gilded Age, many of which surround New England's longest and largest river, the Connecticut River, which flows through the region. The name Pioneer Valley originates in the 20th century with travel writers using it in the 1920s and 1930s to designate the region. In 1939 the Pioneer Valley Association was formed to promote the region using that name. Tourist destination The Pioneer Valley is a popular, year-round tourist destination—a role that it has played historically, prior to its deindustrialization (from approximately 1970–2000). Travelers are drawn to the Pioneer Valley by its lively college towns, such as Northampton and Amherst; the resurgent city of Springfield; its unspoiled nature, numerous parks, and recreational facilities, including New England's largest and most popular amusement park, Six Flags New England in Agawam; its cultural and historical sites, such as the Emily Dickinson House in Amherst, the Springfield Armory National Historical Site, and the Basketball Hall of Fame on Springfield's riverfront. The region features alpine skiing at resorts such as Berkshire East and Blandford Ski Resort and seasonal