PRAYAGRAJ
" Ko kahi sakaie prayag prabhau kalush punj kunjar mrigrau
As tirthpati dekhi suhava sukh sagar Raghubar sukh pawa "
को कहि सकइ प्रयाग प्रभाऊ। कलुष पुंज कुंजर मृगराऊ।।
अस तीरथपति देखि सुहावा। सुख सागर रघुवर सुखु पावा।। - By Ramcharitmanas

Prayag raj which is like a lion, has its unique importance , and can eliminate the biggest heaps of sins and hence no one is competent to describe its glory in any manner.
Sri Ram , who is the supreme of pleasures,also felt over whelmed by visiting Prayag the king of pilgrimages.
Prayagraj is also known as Tirtha Raj, king of all holy places.

त्रिवेणी माधवं सोमं भरद्वाजं च वासुकीम। वन्दे अक्षयवटं शेषं प्रयागं तीर्थनायकं।।
सकल कामप्रद तीरथराऊ। वेद विदित जग प्रगट प्रभाऊ।।

The ancient name of the city is Prayag (Sanskrit for "place of sacrifice"), as it is believed to be the spot where Brahma offered his first sacrifice after creating the world. Since its founding, Allahabad has played an important role in the history and cultural life of India.
The Triveni Sangam in Allahabad is a confluence of 3 rivers, the Ganges, Yamuna, and Saraswati. Of these three, the river Saraswati is invisible and is said to flow underground and join the other two rivers from below. Here the muddy and pale-yellow waters of the Ganges merge with the blue waters of Yamuna. While the Ganges is only 4 feet deep, the Yamuna is 40 feet deep near the point of their nexus. The river Yamuna merges into the Ganges at this point and the Ganges continues on until it meets the sea at the Bay of Bengal. At the confluence of these two great Indian rivers, where the invisible Saraswati conjoins them, many tirtha yatris take boats to bathe from platforms erected in the Sangam. This, together with the migratory birds give a picturesque look to the river during the Kumbha Mela, in the month of January. It is believed that all the gods come in human form to take a dip at the sangam and expiate their sins.

Allahabad was originally founded as Kaushambi Now a separate district by the Kuru rulers of Hastinapur, who developed it as their capital. Since then, Allahabad has often being the political/ cultural/ administrative head of the entire Doab area and beyond. First as Kaushambi, then as Prathisthanpur. Later, the Mughal emperor Akbar renamed Prayag as Allahabad in 1526 and made it a prominent administrative centre again. As a large and growing city, Allahabad is home to many well-recognized colleges and research institutions in India. Many government offices of both central and state government lie within the city. Allahabad has hosted many large cultural and sporting events, including Kumbh Mela. Although Allahabad's economy was built on tourism, its main revenue now comes from real estate and financial services.