Some states are have land very close to each other, but do not share a land border. How many pairs of states can you name that are less than 100 miles (161 km) apart?
"Land border" includes a border over land, a river, or a manmade lake.
State abbreviations are acceptable. So, for example, if Alaska and Hawaii are less than 100 miles apart (they're not), then you can type "AKHI", "HIAK", "Alaska Hawaii", or "Hawaii Alaska" ("Alaska HI", "AK Hawaii" and similar formats are also acceptable).