So imagine you are playing with your toys and you have a big table with a bunch of different paths on it. If you want to get from one toy to another, you have to follow a certain path to get there.
The Northwest Passage Territorial Park is kind of like a big table with a bunch of different paths, except it's outside in the real world! Instead of toys, there are big ships that want to travel through the Northwest Passage, which is a really long route that goes through the Arctic Ocean.
But here's the tricky part: lots of countries want to say that they own parts of this pathway because it's so important for shipping and trading. Canada, for example, says that the Northwest Passage is theirs because it's in their territory.
The Northwest Passage Territorial Park is part of Canada and it's a place where people can visit and learn about the history and importance of the Northwest Passage. There are maps and exhibits that show how people have traveled through this area for many years and how it's become a very important route for shipping.
So, to sum up, the Northwest Passage Territorial Park is like a big table with paths where big ships travel through. Canada says that it's their property because it's in their territory, and this park is a place where people can learn about the history and importance of this pathway.