Which lost continent was initially proposed as a scientific theory before being debunked?

The concept of Lemuria originated in the 19th century as a proposed landmass to explain certain biological and geological phenomena, particularly the distribution of certain species of animals and plants across the Indian Ocean and surrounding areas. The theory suggested that there was once a continent that connected Madagascar to India, providing a migration route for species that were found in both locations but not elsewhere.

This idea was initially embraced by some scientists. However, as further geological and fossil evidence became available, the theory of Lemuria was challenged and eventually debunked. This development highlighted the importance of scientific rigor and evidence-based conclusions in the study of Earth's geological history.

In contrast, Atlantis and Hyperborea are more mythological in nature, lacking a basis in scientific theory. Gondwana, while a legitimate ancient supercontinent supported by geological evidence, is not a theory that was later debunked; it is now recognized as part of Earth’s geological history. Thus, Lemuria stands out as the lost continent that was initially proposed as a scientific theory before being disproven.