Geography plays the largest role in the diversity of the South Asian countries, especially the many island many nations. The mainland of this region consists of Thailand, Cambodia, Vietnam, Myanmar, and Laos. These countries are divided by grand mountains that stretch the length of the region and even further North. The division by the mountains creates a wall with no way to communicate with the people on the other side of the jagged landscape. This enclosed the people of that area to learn from their ancestors and no one else, so many of the civilizations advanced without the help of outsiders.
The island countries had a similar issue except instead of mountains they had developed on small islands which created the distance that the mountains did, but also controlled the space which these cultures could grow. A perfect example is how one island in the archipelago is known worldwide for use rings to lengthen the necks of their women. This tradition is found no where in any of the surrounding islands, so this is a concept of beauty for this small tribe only. Another island thinks that sharpening the women’s teeth is a sign of beauty. These values and beliefs create the diversity between the cultures and with no way to talk to each other from the islands, these tribes have been completely walled off. The climate however, unites the people of these island countries on the idea that farming is necessary for survival in the lowland that the islands provide.