How many Great Lakes are there?

How many Great Lakes are there? How many Great Lakes are there in Canada?有几条,每一条的名称是什么? there are many beautiful lakes and mountains ()are worth vis how many are there How many stars are there? How many birdges are there? how many stop are there How many potatoes are there? how many girls are there how many hens are there how many legs are there? How many squares are there?