Question: The Bow River and the Oldman River converge to form a major river that flows through which provinces in Canada ?

Context paragraphs:
Bow River: The Bow River is a river in the Canadian province of Alberta.  It begins in the Rocky Mountains and winds through the Alberta foothills onto the prairies where it meets the Oldman River, the two then forming the South Saskatchewan River.  These waters ultimately flow through the Nelson River into Hudson Bay.  The Bow River runs through the city of Calgary, taking in the Elbow River at the historic site of Fort Calgary near downtown.  The Bow River pathway, developed along the river's banks, is considered a part of Calgary's self-image.

Hays, Alberta: Hays is a hamlet in southern Alberta, Canada within the Municipal District of Taber.  It is located at the intersection of Highway 524 and Highway 875 between Vauxhall and Redcliff.  The Bow River is 3.3 km to the north of the hamlet and the Oldman River is approximately 19 km to the south.  These two rivers converge to form the South Saskatchewan River approximately 20 km to the southeast.

Little Medicine Bow River: The Little Medicine Bow River is a 66 mi tributary of the Medicine Bow River in Wyoming.  The basin of the Little Medicine Bow includes the northern slopes of the Shirley Mountains as well Shirley Basin.  The Little Medicine Bow reaches its confluence with the Medicine Bow River 6 mi northwest of the town of Medicine Bow.

Oldman River Hydroelectric Plant: Oldman River Hydroelectric Plant is a run-of-river hydroelectric power station owned by Atco Power (75%) and Piikani Nation (25%).  The plant is located on the Oldman River near in Pincher Creek, Alberta, Canada.  The plant is primarily used to supply power onto the Alberta grid.

Little Bow River: The Little Bow River is a tributary of the Oldman River in southern Alberta, Canada.  It is about 190 km long.  From its headwaters near High River, it flows south, then turns east and flows into Travers Reservoir.  Afterwards, it flows southeast into the Oldman River near Picture Butte.  The Little Bow is related to the Bow River as they both ultimately feed the South Saskatchewan River.

Baker Park (Calgary): Baker Park is a 12 ha urban park on the bank of the Bow River in the west edge of the city of Calgary.  It is part of the pedestrian and bicycle Bow River pathway that links a vast network of urban parks on both sides of the river.  Baker Park is situated across the river from Bowness Park east of the Bearspaw Water Intake Pump Station.  With its river observation point overlooking the Bow River and Bowness Park and its archways and arbours, it is the "most popular" park in Calgary for outdoor weddings.

Vauxhall, Alberta: Vauxhall is a town in southern Alberta, Canada within the Municipal District of Taber.  It is located on Highway 36 (Veteran Memorial Highway) approximately 36 km north of Taber, 69 km south of Brooks and 114 km west of Medicine Hat.  It is situated in the prairie land between Bow River and Oldman River.

Elbow Valley, Alberta: Elbow Valley gets its name from the Elbow River, a river in the region that flows into the Bow River at Fort Calgary.  The name for Elbow River is descriptive and refers to the point at which it abruptly turn northward and enters the Bow River (elbow-like curve).  David Thompson referred to it as “Hokaikshi” in 1814, and Arrowsmith’s map of 1859 labels it “Hokaikshi” or “Moose River”.  The Cree called it “o-too-kwa-na” and according to Tyrell, the Stoney referred to it as “mn-no-tho-ap-ta”.  Until 1880, it was often called “Swift Creek”, after the speed of its watercourse.

South Saskatchewan River: The South Saskatchewan River is a major river in Canada that flows through the provinces of Alberta and Saskatchewan.

Oldman River: The Oldman River is a river in southern Alberta, Canada.  It flows roughly west to east from the Rocky Mountains, through the communities of Fort Macleod, Lethbridge, and on to Grassy Lake, where it joins with the Bow River to form the South Saskatchewan River, which eventually drains into the Hudson Bay.

Supporting paragraphs: Hays, Alberta South Saskatchewan River
Answer: Alberta and Saskatchewan