The largest "temporary" tent city in the world is typically set up in Mina, Saudi Arabia, to host over 2 to 3 million pilgrims during the annual Hajj. However, in 2026, the record for the largest singular gathering in a tented environment belongs to the Mahakumbh festival in India. For the 2025 Mahakumbh in Prayagraj, the government of Uttar Pradesh constructed a massive, 4,000-hectare tent city to accommodate an estimated 400 million visitors over a 45-day period. This temporary metropolis includes over 25,000 public accommodations, 2,000 luxury tents, hospitals, and 67,000 streetlights. Unlike the permanent structures in Mina, this "Kumbh" tent city is a feat of seasonal engineering, providing a "city within a city" at the confluence of the Ganges and Yamuna rivers. It serves as a global landmark for logistical scale, housing a population larger than that of many entire countries in a purely temporary, tent-based infrastructure that is dismantled once the auspicious bathing dates conclude.