At 65,610 km2 Sri Lanka is one of the large islands in the Indian Ocean and during the Pleistocene epoch studies have shown that the island was joined to the mainland of the Indian Subcontinent. Due to the cold temperatures of this epoch the scattered glaciers caused the water level to fall and thus much of the places under water today was land during this time. Due to the drop in sea levels Sri Lanka and India was combined for the last time about 7,000 years ago. During the last 500,000 years the island was joined with the Indian mainland several times. According to some scientists during the past 1 million years the two lands were one landmass for most of the time. When the sea level fell approximately 70 meters, Sri Lanka and India was connected by a land bridge of about 100 km in width. Thus this land bridge caused species to inter-migrate between the two lands.
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