What T.S. Eliot meant by writing - Ganga was sunken - in The Wasteland?

In "The Waste Land," T.S. Eliot uses the line "Ganga was sunken" to evoke the river Ganges, a sacred river in Hindu mythology associated with purification and renewal. The image of the "sunken" Ganga symbolizes a loss of spiritual purity and vitality in the modern world, reflecting the overall theme of fragmentation and spiritual emptiness in the poem.