Because the fiber is generally in the ocean to prevent some country to restrict access to others. It all depends on the path the fiber take. The most direct router near you would be via the suez canal but which fibers ISP get on is both a political things as well as financial. Could be you are on a fiber going all the way around africa. This all depends on how ISP are interconnected. You can to a point dig around and find out how ISP are connceted but you can do nothing about the path your data takes. Your only options would be to get a different ISP that maybe has a different path or see if there is a vpn service that has access to a different ISP that has a different path.