In what country did the first UFO sighting take place?

UFO sightings predate recorded history. One of the earliest recorded sightings was in 329 BC, Alexander the great saw two flying shields while attempting to cross a river.

In 593 BC, from the Old Testament book Ezekiel's Wheels, another river crossing, another unidentified and unexplainable sight in the sky.

The next earliest was April 4, 1561, over Nuremberg, Germany.