It extends all the way to Ellesmere Island. It's not just a claim to Arctic international waters; it's claiming Canadian territory based on rules that don't reflect the reality of the north. Those were rules set by seafaring nations that weren't icebound and that were trying to extend jurisdiction out from ports that were accessible.
Those rules are being applied in an area where we don't acknowledge land claims based on sea surface and ice. The UN, however, appears to be perhaps on the cusp of saying that there might be some claim based on ridges under the sea.