Ukhu Pacha is an integral part of Inca cosmology, representing the inner or underground world, which is believed to be inhabited by ancestors and deities associated with fertility and the earth. This concept is part of a tripartite worldview that includes the Kay Pacha (the world of the living) and the Hanan Pacha (the upper world), reflecting a holistic understanding of the universe and the interconnectedness of different realms of existence.