Son River in the context of "Udayin"

Patna (Hindi: Paṭanā, pronounced [ˈpəʈnaː] ), historically known as Pāṭaliputra, is the capital and largest city of the Indian state of Bihar. According to the United Nations, as of 2018, Patna had a population of 2.35 million, making it the 19th largest city in India. Covering 250 square kilometres (97 sq mi) and over 2.5 million people, its urban agglomeration is the 18th largest in India. Patna also serves as the seat of Patna High Court. The Buddhist, Hindu and Jain pilgrimage centres of Vaishali, Rajgir, Nalanda, Bodh Gaya and Pawapuri are nearby and Patna City is a sacred city for Sikhs as the tenth Sikh Guru, Guru Gobind Singh was born here. The modern city of Patna is mainly on the southern bank of the river Ganges. The city also straddles the rivers Son, Gandak and Punpun. The city is approximately 35 kilometres (22 mi) in length and 16 to 18 kilometres (9.9 to 11.2 mi) wide.

One of the oldest continuously inhabited places in the world, Patna was founded in 490 BCE by the king of Magadha. Ancient Patna, known as Pataliputra, was the capital of the Magadha Empire throughout the Haryanka, Nanda, Mauryan, Shunga, Gupta, and Pala dynasties. Pataliputra was a seat of learning and fine arts. It was home to many astronomers and scholars including Aryabhata, Vātsyāyana and Chanakya. During the Maurya period (around 300 BCE) its population was about 400,000. Patna served as the seat of power, and political and cultural centre of the Indian subcontinent during the Maurya and Gupta empires. With the fall of the Gupta Empire, Patna lost its glory. The British revived it again in the 17th century as a centre of international trade. Following the partition of Bengal presidency in 1912, Patna became the capital of Bihar and Orissa Province.

Pataliputra (IAST: Pāṭaliputra), adjacent to modern-day Patna, Bihar, was a city in ancient India, originally built by Magadha ruler Ajatashatru in 490 BCE, as a small fort (Pāṭaligrāma) near the Ganges river. Udayin laid the foundation of the city of Pataliputra at the confluence of two rivers, the Son and the Ganges. He shifted his capital from Rajgriha to Pataliputra due to the latter's central location in the empire.

It became the capital of major powers in ancient India, such as the Shishunaga Empire (c. 413–345 BCE), Nanda Empire (c. 460 or 420 – c. 325 BCE), the Maurya Empire (c. 320–180 BCE), the Gupta Empire (c. 320–550 CE), and the Pala Empire (c. 750–1200 CE). During the Maurya period (see below), it became one of the largest cities in the world. As per the Greek diplomat, traveler and historian Megasthenes, during the Mauryan Empire (c. 320–180 BCE) it was among the first cities in the world to have a highly efficient form of local self government.The location of the site was first identified in modern times in 1892 by Laurence Waddell, published as Discovery of the Exact Site of Asoka's Classic Capital. Extensive archaeological excavations have been made in the vicinity of modern Patna. Excavations early in the 20th century around Patna revealed clear evidence of large fortification walls, including reinforcing wooden trusses.

Amarkantak (NLK Amarakaṇṭaka) is a pilgrim town and a Nagar Panchayat in Anuppur, Madhya Pradesh, India. The Amarkantak region is a unique natural heritage area. It is the meeting point of the Vindhya and the Satpura Ranges, with the Maikal Hills being the fulcrum. This is where the Narmada River, the Son River and Johilla River (tributary of Son) originate.

15th-century Indian mystic and poet Kabir is said to have meditated in Amarkantak, and the place is now known as Kabir Chabutra.

Johilla River is a river in Amarkantak, a pilgrim town in Madhya Pradesh, India. It is a tributary of the Son river, which is a perennial river located in Central India and is the second-largest southern tributary of the Ganges after the Yamuna River.

Singrauli Coalfield is spread across the districts of Singrauli and Sonebhadra in the Indian states of Madhya Pradesh and Uttar Pradesh, mostly in the basin of the Son River.

Yantra (Sanskrit: यन्त्र, romanized: yantrá, lit. 'machine, contraption') is a geometrical diagram, mainly from the Tantric traditions of the Indian religions. Yantras are used for the worship of deities in temples or at home; as an aid in meditation; and for the benefits believed given by their occult powers based on Hindu astrology and tantric texts. They are also used for adornment of temple floors, due mainly to their aesthetic and symmetric qualities. Specific yantras are traditionally associated with specific deities and/or certain types of energies used for accomplishment of certain tasks or vows that may be either materialistic or spiritual in nature. They become a prime tool in certain sadhanas performed by the sadhaka, the spiritual seeker. Yantras hold great importance in Hinduism, Jainism, and Buddhism.

Representations of the yantra in India have been considered to date back to 11,000–10,000 BCE. The Baghor stone, found in an Upper Paleolithic context in the Son River Valley, is considered the earliest example by G. R. Sharma, who was involved in the excavation of the stone (it was dated to 25,000–20,000 BCE). The triangular stone, which includes triangular engravings on one side, was found daubed in ochre in what was considered a site related to worship. Worship of goddesses in that region was found to be practiced in a similar manner to the present day. Kenoyer, who was also involved in the excavation, considered it to be associated with Shakti. This triangular shape looks very much similar to Kali Yantra and Muladhara Chakra.