Which US state borders have you been across?

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I've been to most of the 50 US states, but I've only ever flown into some of them, which feels like cheating. Here are the state borders I've crossed (while on foot or in a ground vehicle):

AZ-CA
AZ-NV
CA-NV
CO-NM
CT-MA
CT-NY
CT-RI
DE-MD
DE-NJ
GA-NC (this is a fairly unusual one, I'm guessing)
MD-VA
MA-VT
MA-NH
MA-RI
MI-OH
NJ-NY
NJ-PA
NY-PA
NC-VA
OH-WV
PA-WV

Which state borders have you been across? Leave a list in the comments!