Which city is located at the confluence of Ganga and Yamuna?

2 years (Maha Kumbh) and Ardh Kumbh every 6 years. Option A (“Varanasi”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option B (“Haridwar”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option D (“Kanpur”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. The key concept is to match the water body with its basin, type, location and defining feature. Therefore the correct option, index and explanation consistently identify Prayagraj. Prayagraj (formerly Allahabad) is located at the Triveni Sangam, the confluence of the Ganga and Yamuna rivers (along with the mythical Saraswati). Prayagraj is known as the 'City of Confluence' and is one of the holiest cities in India. The Kumbh Mela is held here every 12 years (Maha Kumbh) and Ardh Kumbh every 6 years.