Photographer Marcos Lira visited the remote tribes of the Omo Valley, Ethiopia.
Their remoteness and inaccessibility has enabled the tribes to resist outside influence.
Ethiopia is building a series of hydroelectric dams along the river Omo to develop the country.
People in the capital, Addis Ababa, say that the people of the Omo Valley are “uncivilized” and their lack of skills makes it difficult to assimilate them into modern society.
However, these tribes have unique rituals that will be lost forever through the effort to develop the land.