Some are big enough to swallow a full car.
Sinkholes are forming in a Quebec City neighbourhood, collapsing the earth and leaving experts baffled.
The city has issued an evacuation order. People in 15 homes and one business have been ordered to leave.
There are about 40 holes and they range between six metres wide and five metres deep in the north end neighbourhood of the city.
City officials are concerned about the sinkholes and their potential for danger.
They started to appear over the last week and soil experts are taking samples to try and find out what's behind the collapses.
Officials say the field where the sinkholes developed was originally a sandpit.
According to one Quebec City engineer, the soil results will be available in about two weeks.
This isn't the first time Quebec has dealt with sinkhole problems. A family of four were killed in St.-Jude about a year ago. Their house was swept away by a landslide.
With files from The Canadian Press