Delhi and Chandigarh are union territories lying in the flat Northern Plains of India.
Delhi is the capital of India and has an ancient history of urbanisation while Chandigarh is one of the most well-planned cities.
Both Delhi and Chandigarh have good water supply due to river Yamuna and the Bhakra Canal.
As compared to the other cities in North India, both the cities have well-developed infrastructure, good transport links and other amenities.
Fast developing industries and commercial centres in these places, offer high employment opportunities leading to urbanisation.
Hence, except Delhi and Chandigarh, urbanisation is low in other parts of India.