Which country is the oldest in the world?

Which country is oldest depends on the definition. San Marino, a tiny state inside Italy, traces its founding to 3 September 301 AD, when a stonemason named Marinus set up a community on Mount Titano, and it is widely recognised as the oldest surviving sovereign republic. Its statutes of 1600 are considered the oldest written constitution still in force. Egypt was first unified as a state around 3100 BC, making it one of the oldest continuous civilisations. Japan traditionally dates its founding to 660 BC, and its imperial family is the oldest continuous hereditary monarchy in the world.