The Tapi River (Hindi ताप्ती, Marathi तापी, Gujarati: તાપ્તી) ancient original name Tapi River (Sanskrit: तापी), is a river in central India. It is one of the major rivers of peninsular India with a length of around 724 kilometres (450 mi). It is one of only three rivers in peninsular India that run from east to west - the others being the Narmada River and the Mahi River. The river rises in the eastern Satpura Range of southern Madhya Pradesh state, and flows westward, draining Madhya Pradesh's Nimar region, Maharashtra's Kandesh and east Vidarbha regions in the northwest corner of the Deccan Plateau and south Gujarat, before emptying into the Gulf of Cambay of the Arabian Sea, in the Surat District of Gujarat. The river, along with the northern parallel Narmada river, form the boundaries between North and South India. The Western Ghats or Sahyadri range starts south of the Tapti River near the border of Gujarat and Maharashtra. The Tapti (Tapi) River empties into the Gulf of Khambhat near the city of Surat in Gujarat.

Guru Nanak (Punjabi: ਗੁਰੂ ਨਾਨਕ; Hindi: गुरु नानक, Urdu: گرونانک [ˈɡʊɾu ˈnɑnək] Gurū Nānak) (15 April 1469 – 22 September 1539 at Talwandi (present-day Pakistan)) was the founder of the religion of Sikhism and the first of the ten Sikh Gurus.

The Sikhs believe that all subsequent Gurus possessed Guru Nanak’s divinity and religious authority, and were named "Nanak" in the line of succession.

Guru Nanak was born on 15 April 1469, now celebrated as Prakash Divas of Guru Nanak Dev, into a Hindu Khatri family in the village of Rāi Bhōi dī Talwandī, now called Nankana Sahib, near Lahore, Pakistan. Today, his birthplace is marked by Gurdwara Janam Asthan. Some are of the opinion that 20 October is his enlightenment day rather than his birthday. His father, Kalyan Chand Das Bedi, popularly shortened to Kalu Mehta, was the patwari (accountant) of crop revenue for the village of Talwandi in the employment of a Muslim landlord of that area, Rai Bular Bhatti. Guru Nanak’s mother was Tripta Devi and he had one elder sister, Bibi Nanaki who became a spiritual figure in her own right.