How to Say "boundaries" in Spanish
The most common Spanish word for “boundaries” is “límites” — use 'límites' when referring to physical edges, personal space, or clearly defined restrictions..
English → Spanish
límites
nounA1general
Use 'límites' when referring to physical edges, personal space, or clearly defined restrictions.
Examples
Hay límites de velocidad en esta carretera.
There are speed limits on this road.
fronteras
/frown-TEH-rahss//fɾonˈteɾas/
nounB2general
Use 'fronteras' for abstract, metaphorical, or intellectual limits, often related to concepts, knowledge, or imagination.

Examples
La tecnología expande las fronteras de lo posible.
Technology expands the boundaries of what is possible.
La ciencia busca expandir las fronteras del conocimiento.
Science seeks to expand the boundaries of knowledge.
Su imaginación no tiene fronteras.
His imagination has no boundaries.
Metaphorical use
When used metaphorically, it acts exactly like the physical version but describes abstract things like 'knowledge' or 'dreams'.
Límites vs. Fronteras
Learners often confuse 'límites' and 'fronteras'. Remember that 'límites' is more common for everyday, concrete restrictions like personal space or speed limits, while 'fronteras' is typically used for more abstract or expansive limits like knowledge or potential.
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