A representation of Varaha, the boar Avatar of Vishnu. One of the hundreds of carving on the interior of the Queen’s Stepwell (Rani Ki vav) in Patan, Gujarat.
The story behind Varaha (which I suspect has undergone, literally, thousands of mutations over the millennia), is that at one point a demon took the Earth and hid it underneath the sea. Vishnu transformed into Varaha to go and save it. In the iconography, the Earth is personified as a goddess, Bhumi Devi, who you can see here raised up on his elbow.