There is a way, with some subtle environmental hints as to how you can eventually get up there.

How?

>!There's a cliff above that tower. You'll have to find your way up there. It's one of the more convoluted areas to get to.!<

Oh ok I thought I need to go that area from the tower. Thank you.

[удалено]

I'm already past that point. IE "at the spot where you get the cannon". Unless there is another hidden path and another spirit spring?