Greendale is a primarily agricultural settlement within Chilliwack, British Columbia, Canada, located 92 kilometres (57 mi) east of the City of Vancouver. Greendale is located on the west side of Chilliwack, bordering the east side of the City of Abbotsford. The Vedder River forms the border between Greendale and Yarrow which lies to the South. Greendale, originally called Sumas until 1951 but was renamed because of the name of the adjoining municipality, the District of Sumas (now part of the City of Abbotsford), and also including Sumas, Washington. The area was once a 10,000 acres (4,000 ha) lake at the base of Sumas Mountain. Sumas Lake was drained in the early 1920s.