Territorial waters

For the same reason the Northwest Angle is in Minnesota. The agreement on where the border along 49°N goes between two points, and that is where it ends. It jerks back like that because those islands south of it are claimed by Canada. If they weren't there, the border would probably have gone straight down.

Lots of people think Windsor is the only place along the southern border where Canada looks north to the USA, but there are actually many places in Northwestern Ontario where the border is both on land, and Canadian territory is located southwest of the United States, as it zig-zags along water ways (which isn't entirely possible, due to the border crossing through three watersheds, hence the land borders).

Holy crap.

SnowMan said:

This area lies between two Canadian lands and therefore is must belong to Canada..But according to all maps this territorial waters is belong to USA...


Is there any small island or islet on that territorial waters which is belong to USA ..?

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The line that follows the 49th parallel is probably designated to end at the deep water channel in that strait. You usually see this with states and provinces with rivers as borders.

SnowMan said:

If north of 49th parallel belongs to Canada, why doesn't alaska belong to canada?:lol:

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Because Russian Empire sold Alaska to the USA and not Britain? The 49th parallel as a border line between the USA and Canada was finalised in 1846, but at that time Russia still had possession of Alaska. The USA bought Alaska in 1867. Anyway, it's a different story not related to the 49th parallel.