Some selected quotes on the river Ganges

Mother Ganges is worshiped by the water of the Ganges: a devotee takes a little water from the Ganges and offers it back to the Ganges. When the devotee takes the water, mother Ganges does not lose anything, and when the water is offered back, mother Ganges does not increase, but in this way the worshiper of the Ganges is benefited. Similarly, a devotee of the Lord offers the Lord patraṁ puṣpaṁ phalaṁ toyam—a leaf, flower, fruit or water—in great devotion, but everything, including the leaf, flower, fruit and water, belongs to the Lord, and therefore there is nothing to renounce or to accept. One must simply take advantage of the bhakti process because by following this process one does not lose anything but one gains the favor of the Supreme Person. (SB 9.9.12)

When there was a meeting of great sages at Naimiṣāraṇya, Sūta Gosvāmī was reciting Śrīmad-Bhāgavatam, and the importance of the Ganges was stated as follows: “The waters of the Ganges are always carrying the flavor of tulasī offered at the lotus feet of Śrī Kṛṣṇa, and as such the waters of the Ganges are ever flowing, spreading the glories of Lord Kṛṣṇa. Wherever the waters of the Ganges are flowing, all will be sanctified, both externally and internally.” ( Nectar of Devotion Chapter 7)