[[File:Cloverleaf interchange.svg|thumb|left|upright|Sk Hwy 6 and Sk Hwy 1, the TransCanada Hwy Cloverleaf interchange south of Regina one of the first two SK interchanges which opened in 1967. ]] Hwy 6 reaches Regina, which is the capital of Saskatchewan and is the second largest in the province (after Saskatoon). Regina was previously the headquarters of the North-West Territories, of which today's provinces of Saskatchewan and Alberta originally formed part, and of the District of Assiniboia. The city is situated on a broad, flat, treeless plain. There is an abundance of parks and greenspaces: all of its trees – some 300,000 – shrubs and other plants were hand-planted and Regina's considerable beauty is entirely man-made. As in other prairie cities, American elms were planted in front yards in residential neighbourhoods and on boulevards along major traffic arteries and are the dominant species in the urban forest. The IPSCO Wildlife Park is located off Hwy 6 at Regina.