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Bifurcation occurs at the Great Lakes, where the Mississippi flows into the gulf and the St. Lawrence empties into the Atlantic. This forms the “great loop”, a

by elf25 2y ago

Bifurcation occurs at the Great Lakes, where the Mississippi flows into the gulf and the St. Lawrence empties into the Atlantic. This forms the “great loop”, a circumnavigation course known by many power boaters . This makes about half of the United States and island by your definitions.

bryanlarsen 2y ago
The Chicago - Great Lakes connection is man made, so doesn't count per the methodology of the OP.
- Nevermark 2y ago
  So North and South America are not the North and South Panama Canal Islands. Got it!
- Kon-Peki 2y ago
  The permanently navigable connection is man made. It was seasonally connected (and navigable by canoe), requiring a very short portage the rest of the year.