When we think of Canada’s oilsands, we often picture vast industrial landscapes in northern Alberta. But what many don’t realize is just how massive the environmental footprint has become — particularly the tailings ponds. In fact, the combined size of these ponds now surpasses the entire city of Vancouver.

Tailings ponds are used to store the toxic byproducts from oilsands mining, including water, sand, clay, and residual bitumen. Over decades of production, these ponds have expanded to cover more than 300 square kilometers — bigger than Vancouver’s 115 square kilometers. From space, they appear as sprawling, artificial lakes, some stretching as far as the eye can see.

The size isn’t the only concern. These ponds pose serious environmental risks, including leaks into nearby rivers and groundwater. In March 2023, there were reports of major leaks from oilsands tailings ponds, raising alarms among Indigenous communities, environmentalists, and scientists across Canada.

Despite efforts to reclaim and reduce these ponds, the pace has been slow, and cleanup could take decades — if not longer. As Canada grapples with balancing energy production and environmental protection, the sheer scale of the oilsands tailings ponds serves as a stark reminder of the challenges ahead.