Amazonas is a department of Southern Colombia in the south of the country. It is the largest department in area while also having the 3rd smallest population. Its capital is Leticia and its name comes from the Amazon River, which drains the department.
The department name comes from the name of the Amazon River. The river was named by the Spanish explorer Francisco de Orellana (1511 - 1546), who, on his voyage of exploration, said he was attacked by "fierce females" looked like Amazons of the Greek mythology, however, the existence of a female warrior tribe in that time hasn't been demonstrated and it is possible that they were long-haired Native American warriors who impressed the conqueror who called the jungle and the river with the name of Amazon.