Which is the oldest city in the world Varanasi?

What is the next name of Varanasi?
Varanasi | History, Map, Population, River, Pilgrimage ...
Varanasi, also called Benares, Banaras, or Kashi, city, southeastern Uttar Pradesh state, northern India. It is located on the left bank of the Ganges (Ganga) River and is one of the seven sacred cities of Hinduism.