a geographical region of northeastern South America including Guyana and Surinam
"The flora of that vast Guiana region is unique to northeastern South America, encompassing both Guyana and Surinam."
A geological region in the north of South America.
"The Guiana Shield forms a vast, ancient geological foundation beneath the northern part of South America."
The word comes from a local language, likely Cariban or Arawak, and originally meant "land of many waters." It entered English through the French spelling of the country's name.