How to Say "wilderness" in Spanish
The most common Spanish word for “wilderness” is “naturaleza” — use 'naturaleza' when referring to the natural world, undeveloped areas, or the concept of nature in general, often in a positive or neutral context..
naturaleza
nah-too-rah-LEH-sah/na.tu.ɾaˈle.sa/

Examples
Me encanta caminar por la naturaleza para relajarme.
I love walking through nature to relax.
Debemos proteger la naturaleza de la contaminación.
We must protect nature from pollution.
El documental era sobre la belleza de la naturaleza amazónica.
The documentary was about the beauty of Amazonian nature.
Always Use 'La'
Since 'naturaleza' is an abstract noun used in a general sense, you almost always need to use the feminine article 'la' before it, even when English doesn't use 'the'.
Missing the Article
Mistake: “Me gusta naturaleza.”
Correction: Me gusta la naturaleza. (When talking about nature in general, Spanish requires 'la'.)
selva
/sel-vah//ˈselβa/

Examples
La ciudad se convirtió en una selva de cemento donde solo sobreviven los más fuertes.
The city turned into a concrete jungle where only the strongest survive.
El mercado financiero es una selva; hay que tener cuidado con las inversiones.
The financial market is a jungle; you have to be careful with investments.
Figurative Use
This meaning uses 'selva' to compare a difficult situation (like a competitive office or a big city) to a literal jungle.
Nature vs. Concrete Jungle
Related Translations
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