Which of the following countries is home to the tallest cliff face in the world?

Well that’s embarrassing, I’m from Canada and did not know this. Interesting. It’s certainly in a remote area that’s not frequented by tourists or even other Canadians. But still, you would think a Canadian would know this….

I had to search more. It "features Earth's greatest vertical drop of 1,200 m (4,100 ft), with the cliff overhanging at an average angle of 15 degrees from vertical".

I'm trying to work out what is a "105° slope". It seems like the top is 15° back from the base, i.e. overhanging. Wouldn't a sheer, vertical cliff be 90°? Wouldn't a slope would be a much smaller angle? I'm confused.