When Europeans first arrived in the western Amazon Basin in significant number in the late 17th and early 18th century, Omagua was spoken by approximately 100,000 individuals in two major areas: along the Amazon River proper, between the mouths of the Napo River and Jutaí River, and in the vicinity of the Aguarico River, a tributary of the upper Napo River.
There were four crew and nine passengers aboard—all Peruvian— when the flight crashed in the Napo River.
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After following the courses of the Coca and Napo rivers, the expedition began to run out of provisions.
They once occupied some 12,000 mi² between the Napo River and the Pastaza.