The Corner Corner documents, but cannot truly explain, the hobby of visiting locations like:
For details on any US tri-state, click the boundary junction on the map below.
United States Multi-point Index - Sixty-five locations where 3 or more states meet at a point (includes the District of Columbia.)
Canadian Multi-point Index - Four locations where 3 or more provinces meet at a point, including the Canadian Four Corners.
US/Canada Tri-point Index - Eighteen points where 2 states and a province, or 2 provinces and a state meet.
Extremity Index - The northernmost, easternmost, southernmost, and westernmost points of the states and provinces.
Brian and Gregg Butler's 2001 Expedition - Twenty-nine points and 7700 miles in 18 days.
2000 Holliston Boundary Report - Brian & Joan Butler inspect and mark the bounds.
Tri-State Corners in the United States by Jack Parsell - PDF download (4656KB)