Holland River

The river flows generally north, and its headwaters lie in the Oak Ridges Moraine.

The Holland River watershed is approximately 600 square kilometres (230 sq mi), spanning an area that includes New Tecumseth, King Township, Newmarket, Aurora, East Gwillimbury, and Whitchurch-Stouffville.

The river's watershed also contains the Holland Marsh, a fertile farmland region renowned for its vegetable production.

[1] It was renamed by Lieutenant-Governor Simcoe after Captain Samuel (Johannes) Holland, (1729–1801), Dutch-born first Surveyor General of British North America.

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Holland River enters Cook's Bay in the lower portion of this 2013 aerial photo
Aerial view of Holland River as it approaches Cook's Bay (2013)
Holland River, Newmarket