The correct answer is Triveni Sangam.
Triveni Sangam is the confluence of the Ganges, Yamuna, and Saraswati rivers in Allahabad, India. It is one of the most sacred Hindu pilgrimage sites, and is believed to be the place where the gods Brahma, Vishnu, and Shiva met to create the universe.
The Shivnath, Mahanadi, and Arpa rivers are all tributaries of the Ganges. The Shivnath river originates in the Kaimur Range in Bihar, India, and flows for about 200 kilometers before joining the Ganges near Patna. The Mahanadi river originates in the Amarkantak hills in Madhya Pradesh, India, and flows for about 860 kilometers before joining the Ganges near Chatra, Jharkhand. The Arpa river originates in the Kaimur Range in Bihar, India, and flows for about 100 kilometers before joining the Ganges near Arrah.
The confluence of the Shivnath, Mahanadi, and Arpa rivers is a sacred site for Hindus. It is believed that bathing in the confluence of these rivers will cleanse one of all sins. The site is also a popular tourist destination.