The object in sentence can be regarded as the "thing or person" the the action of the verb was directed to, i.e the receiver of the action of the particular verb. The object signify the particular thing that the " subject" perform action on. The subject is the performer of the particular action.
The ancient Babylon (located in west Asia), ancient Egypt (located in north Africa), the ancient India， which is located in the South Asia and China which is located in east Asia.
