ग्रहाणां च यथा सूर्यो नक्षत्राणां यथा शशी ॥
तीर्थानामुत्तमं तीर्थं प्रयागाख्यमनुत्तमम् ।
- पद्मपुराणम्, ६.२४.३[२],४[१]

Just as the Sun is among the planets and the Moon is among the stars, the best among all Tirthas (holy places) is the one known as Prayaga.