Answer: amazonia

AnswerCrossword Clue
AMAZONIA

Vast river basin

AMAZONIA

Endangered South American watershed

AMAZONIA

Vast rainforest

AMAZONIA
World's largest rainforest
AMAZONIA
Ecologically-threatened South American region
AMAZONIARain forest region
AMAZONIAEndangered watershed
AMAZONIAAbout a third of South America