The United States
The 48 contiguous United States and the 107 internal borders within them.
oOo
ME NH MA RI
ND MN MI VT CT
WA ID MT SD   WI NY
OR   WY IA IL MI OH PA NJ
NV UT NE MO IN WV    DE
CA CO KS KY MD
AZ NM OK    VA
TX AR TN NC
LA MS AL GA SC
FL