Cypress Hills Interprovincial Park is a natural park in Canada straddling the Alberta / Saskatchewan boundary and jointly administered by the two provinces. Located south-east of Medicine Hat in the Cypress Hills, it became Canada's first interprovincial park in 1989.^[1]

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Cypress Hills Interprovincial Park
IUCN category II (national park)
Cypress Hills
Location of Cypress Hills Interprovincial Park in Canada
Location	Cypress County, Alberta RM of Maple Creek No. 111, Saskatchewan , Canada
Nearest city	Medicine Hat, AB; Swift Current, SK
Coordinates	49°34′31″N 110°00′23″W
Area	400 km2 (150 sq mi)
Established	1931 (Saskatchewan) 1951 (Alberta) 1989 (interprovincial)
Governing body	Alberta Environment and Parks and Ministry of Parks, Culture and Sport (Saskatchewan)

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The park consists of two protected areas, the 345 km² (133 sq mi) West Block, that straddles the Alberta / Saskatchewan boundary between Alberta Highway 41, the townsite of Elkwater, Saskatchewan Highway 615, Saskatchewan Highway 271, and Fort Walsh, and the Centre Block, an additional area of 58 km² (22 sq mi) in Saskatchewan, west of Saskatchewan Highway 21.

The Cypress Hills plateau rises up to 200 m (660 ft) above the surrounding prairie, to a maximum elevation of 1,468 m (4,816 ft) at "Head of the Mountain" at the west end in Alberta,^[2] making it Canada's highest point between the Canadian Rockies and the Labrador Peninsula.^[3] Eastward across the boundary is the highest point in Saskatchewan, at 1,392 m (4,567 ft).^[4] The "West Block" of the Cypress Hills spans the provincial boundary. Battle Creek runs through the central part of the park. Although the hills seem relatively low, in a larger geographic context the plateau does rise gradually from many kilometres away so that the total elevation gain from Medicine Hat is approximately 600 metres (2,000 ft).

• 1931 — Cypress Hills Provincial Park was established in Saskatchewan.^[5]
• 1951 — Cypress Hills Provincial Park was established in Alberta.
• 1989 — On August 25, the governments of Alberta^[6] and Saskatchewan^[7] signed an agreement committing themselves to cooperation on ecosystem management, education, and park promotion.
• 2000 — Fort Walsh National Historic Site (located on the Saskatchewan side of the West Block) joined the collective. Together, these three partner agencies make up the park. Both Alberta and Saskatchewan provincial governments signed the Cypress Hills Interprovincial Park agreement, establishing the first interprovincial park in Canada.
• 2001 — On August 18, Vance Petriew discovered a comet from Cypress Hills during the Saskatchewan Summer Star Party.^[8] The comet was later named 185P/Petriew.
• 2004 — On September 28, Saskatchewan Parks, Alberta Community Development, Parks Canada and the Royal Astronomical Society of Canada signed an agreement that declared the park a dark-sky preserve.
• 2011 — On August 25, the Park opened the Cypress Hills Observatory and Yurt classroom.^[9]

On both sides of the park, all year long, park interpreters present education programs to school and youth groups, adult and seniors groups, and a wide range of park visitors. During the summer months, there's camping, hiking, and swimming. During the winter, there's skiing, winter camping, snowmobiling, and other winter activities. In summertime, kayak, canoe, bicycle, and stand up paddle boards are available for rent. In the winter, kicksleds, snowshoes, skates, and cross-country skis rentals are available.

Approximately 700 species of plants and animals thrive in the park, including 14 species of orchids.

The park protects the majority of the Cypress Hills landscape, which consists of three separate elevated blocks of lush forest and fescue grassland surrounded by dry mixed-grass prairie. The West and Centre Blocks are protected as provincial parks, and are managed by Alberta Parks and Protected Areas^[19] and Saskatchewan Parks,^[20] respectively. The "East Block" of the Cypress Hills, situated near Eastend, Saskatchewan, is not a park or protected area. The Fort Walsh National Historic Site is also located adjacent to the West Block.

• List of protected areas of Alberta
• List of protected areas of Saskatchewan
• List of highest points of Canadian provinces and territories
• List of ski areas and resorts in Canada