Qual é o oceano mais profundo do mundo?

Questions & Answers about Qual é o oceano mais profundo do mundo?

Why is it o oceano mais profundo and not o mais profundo oceano?
In Portuguese, to form this kind of superlative, we usually put the noun before the adjective. We use the definite article (o, a, os, as) followed by the noun, then mais, and finally the adjective. So, the deepest ocean translates literally as the ocean most deep (o oceano mais profundo).
Why does the sentence use do mundo instead of no mundo for in the world?
When forming a relative superlative (saying something is the most or least out of a group or place), Portuguese uses the preposition de (of) to define the group. Since mundo is masculine, de + o becomes do. We literally say it is the deepest ocean of the world!
Why do we use Qual instead of O que for Which or What here?
We use Qual (or the plural Quais) when asking to identify a specific thing from a known group or category. Since we are asking to pick one specific ocean out of all the oceans on Earth, Qual is the correct choice. O que is used for more open-ended questions, like asking for a general definition.
If we were asking about a feminine word, like a mountain (montanha), how would this sentence change?
The articles and adjectives must match the noun in gender. If we asked about the highest mountain, it would be: Qual é a montanha mais alta do mundo? Notice that the masculine article o changes to the feminine a, and the adjective ends in -a (alta) instead of -o (profundo) to match the feminine noun.

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