Ky would be making a sensible, reasonable passage to Sabine, which was the closest source of ag equipment.
The closest source of oil swam in the sea.
His palace and the cloisters are the closest source of wood available.
Its closest source would have been Anatolia, today's Turkey.
The most likely source was the closest source-- the earth itself.
The closest source of open water is at the mouth of the Saint Lawrence River.
The closest source of coffee was in Thendara, a good, long ride away.
"That Army camp is about the closest source of doggie blood."
The stones are of millstone grit, probably quarried from Plumpton, the closest source of this material.
Middle Eastern oil remains Japan's closest and cheapest source of fuel.