This is the 4395th most frequent Spanish word.
ucayali
"Ucayali" is not a Spanish word but the name of a river and region in Peru.
The word 'Ucayali' here is used as a proper noun, referencing a specific geographical location, namely, a river in Peru.
El río Ucayali es uno de los principales afluentes del Amazonas.
The Ucayali River is one of the main tributaries of the Amazon.
In this sentence, 'Ucayali' serves as a proper noun and a direct reference to the region named Ucayali, focusing on its ecological aspects.
He leído un libro fascinante sobre la biodiversidad del Ucayali.
I have read a fascinating book about the biodiversity of the Ucayali.
Here, 'Ucayali' is used as a geographical identifier referring to the Ucayali region, emphasizing its anthropological attributes.