this northern remnant of Saraswati in Kurkukshetra region ( Hariyana ) dried up. Dhrisadwati too dried up. Thus in Kali Yuga people depended solely on Ganga river. Thus the migration of people from Saraswati to Ganga became fully complete in Kali Yuga1 (3000 BC to 2000 BC). Desert mentioned in Ramayana