Where was Magadha located?

Hint: Magadha was considered as the most powerful and the largest one among the sixteen Mahajanpadas. It was situated near river Ganga in the north along with River Champa in the east, and River Son in the west.

Complete step by step solution:
Magadha was located in the present-day state of Bihar and included districts of Arwal, Nawada, Nalanda, Patna, Jehanabad, Aurangabad, and Gaya. The major religions in the territory of Magadha were Buddhism, Hinduism, and Jainism. Religion had a great influence on the culture as it can be seen in the works of art and architecture which were found here.
The capital city of Magadha was Rajagriha which was later shifted to the city of Patliputra. Magadha kingdom expanded and eventually took over the states of Orissa, Jharkhand, West Bengal, and the eastern part of Uttar Pradesh along with these it also included some parts of Nepal and Bangladesh. People here were majorly influenced by Buddhism. Gautam Buddha the founder of Buddhism had spent most of his life in the Kingdom of Magadha and gave his first Buddhist council was held in the first capital of Magadha, Rajagriha. Magadha has been mentioned in many Buddhist texts which reflect the importance of Buddhism in the region.

Note: Several dynasties ruled the region of Magadha but the most famous one among them is the Mauryan Dynasty. The first ruler in this region was Bimbisara and after him his son, Ajatashatru came into power. The Mauryan Dynasty was founded by Chandragupta who defeated Mahapadma Nanda and established the Mauryan dynasty in Magadha.