How to Say "small lake" in Spanish
The Spanish word for “small lake” is “laguna” — A2 level. This is a very common word in everyday Spanish.

Examples
La laguna tiene agua muy clara.
The lagoon has very clear water.
Muchos flamencos viven en esta laguna salada.
Many flamingos live in this salt lagoon.
Fuimos a caminar alrededor de la laguna por la tarde.
We went for a walk around the small lake in the afternoon.
Feminine Noun Patterns
Like most words ending in 'a', laguna is feminine. You should always use feminine markers like 'la', 'una', or 'esta' with it.
Describing the Water
When describing the water in a laguna, the adjective comes after the noun, such as 'laguna azul' (blue lagoon).
Laguna vs. Lago
Mistake: “Using 'lago' for every body of water.”
Correction: Use 'laguna' for smaller, shallower bodies of water, or those specifically separated from the ocean by reefs or sandbars.
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