Banana species can be traced through the physical record in the earth moving from India, across southern China and down through SE Asia to the Wallace Line which marks the position of the two plates, Asia and Australia. The gray areas show the shorelines during the Ice Ages when Bananas and many other plants would have been forced in front of the Ice Sheet. Most of these stopped at the Wallace line which is marked by a deep trench that stands as a barrier to the movement of larger flora and fauna. The many small islands between there and Australia and New Guinea are a mix of the more ‘mobile’ species. Bananas are native to those lands above this line including the Philipinnes.