Bosque vs. floresta
While both bosque and floresta can be translated as forest in English, they are not always interchangeable. The choice between them often depends on the type of forest, the context, and the desired nuance, with bosque being the much more common and general term.
Bosque
A2Bosque is the standard, everyday word for forest in Spanish. It is a very general term that can refer to any large area of land covered with trees, regardless of the type of trees or climate. It's the most frequently used and universally understood word for this concept.
Fuimos a dar un paseo por el bosque detrás de mi casa.
(We went for a walk in the forest behind my house.)
El oso pardo habita en ese denso bosque de pinos.
(The brown bear lives in that dense pine forest.)
Es importante proteger el bosque de los incendios forestales.
(It is important to protect the forest from wildfires.)
Se perdieron en el bosque mientras buscaban setas.
(They got lost in the forest while looking for mushrooms.)
Chapultepec es un gran bosque urbano en la Ciudad de México.
(Chapultepec is a large urban forest in Mexico City.)
Floresta
B2Floresta is a less common and more literary or poetic term for forest. It often evokes an image of a particularly lush, dense, and wild forest, sometimes with a romantic or magical feel. It can also be used in technical or geographical contexts to refer to vast, often tropical, wooded areas.
El caballero se adentró en la umbría floresta sin miedo.
(The knight ventured into the shady forest without fear.)
La Floresta Amazónica es el hogar de innumerables especies.
(The Amazon Forest is home to innumerable species.)
El poema describía una floresta encantada llena de criaturas mágicas.
(The poem described an enchanted forest full of magical creatures.)
La expedición científica estudió la biodiversidad de la floresta tropical.
(The scientific expedition studied the biodiversity of the tropical forest.)
Antiguamente, una espesa floresta cubría todo el valle.
(In ancient times, a thick forest covered the entire valley.)
Summary
In summary, use bosque as your default, all-purpose word for forest in almost any situation. Reserve floresta for more poetic, literary, or grandiose contexts, or when referring to vast, dense (often tropical) wooded expanses in a more technical or formal way. While a floresta is always a type of bosque, not every bosque is lush or vast enough to be called a floresta.