Ontario's plan to curb urban sprawl in southern Ontario has won it a prestigious U.S. award.

The American Planning Association announced Tuesday that Ontario's "Places to Grow" plan has been awarded the 2007 Daniel Burham Award, which honours excellence in large-scale planning.

The provincial government is the first non-American recipient of the award.

APA calls the government's plan "groundbreaking" in its effort to establish tightly-packed, mixed-use areas by setting minimum density levels whenever development takes place.

Over the next 25 years, an estimated four million people are expected to move into the Greater Golden Horseshoe, a sprawling area that includes Toronto, its surrounding metropolitan area and more than 100 municipalities.

The area stretches west to the Waterloo Region, north to Barrie and northeast to Peterborough. 

Under the plan, about 40 per cent of those moving to the Greater Golden Horseshoe will be forced into existing urban areas.

The plan also involves co-ordinating transportation throughout the region.