There's also a short land ("50 yards"!) border between India and Sri Lanka, on Dhanushkodi/Adam's Bridge, according to at least some online sources (mostly copies of Wikipedia, but not all, but nothing authoritative that I could find). And apparently (this bit comes from some uncertain temple records, so is historically debatable, but isn't just a Wikipedia myth) Adam's Bridge was actually a full land bridge between Sri Lanka and the mainland until 1480!
…so, yeah, none of this is probably substantiated enough to become a full answer, but I thought it was cool enough to be worth sharing :-) |
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