This particular anchor was found in Halifax, Nova Scotia. It measures 11.5' or 3.5 meters high & 7.7' or 2.3 meters across the flukes and weighs 2.5 tons.
In 1917, a great explosion levelled much of the city of Halifax; two ships collided, one of them carrying many explosives.
It's thought that the explosion threw this anchor ashore in the inner harbour, where it was found many years later.