Note the Kumari Mountain , indicated by an arrow in the First Image, and it starts from what is the presently known as the Western Ghats and extends to Madagascar, where the Mascarene plateau lay in ancient times. Since Satyavrata Manu was meditating on t a higher plane because of the great flood, the Mascarene plateau fits. As He is reported to have meditated in Malayamarutha, I am of the opinion that the Malayamarutha lay somewhere in Mascarene plateau..
The Atlantis people' sealing the Lemurians' probably means the Mascarene plateau. Lemuria existed south of this plateau, which was consumed by the sea about 6000 years ago. The surfacing of Rama dynasty may indicate the fact that Satyavrata Manu ancestor of Rama had migrated to Ayodhya(whose son Ikshvaku founded the Ikshvaku Dynasty) and the subsequent emergence of Lord Rama and His Kingdom. One may note that the Ramayana and the Puranas call the Tamil areas as Dravida, meaning South, Dasyu, meaning who do not follow all the percepts of Sanatana Dharma( though they were practicing Sanatana Dharma they were not Fire (Agni) worshipers),and Viswamitra banished his sons to the south directing them to go to the Dasyu Land.