Hmmmm ... best I can recall ...

North: Going around Lake Superior on the Canadian side, or, Matsushima Bay, Japan (Not sure which is further north ... but probably Canada.)

South: Tijuana, Mexico (on a business trip to San Diego, two of us crossed into Mexico and shopped a bit)

East: Austria

West: Sendai or Yokohama, Japan (Yokohama is 200 miles south of Sendai and maybe a little further west, I think)