"The corner"

Translation: A esquina

[Danmoller]

Esquina is the corner formed by two streets.

If the corner is formed by walls, it's "o canto".

[simbarashey]

So “o canto do quarto” would be the corner of the room?

[Paulenrique]

Yes.

[Radiofonico33]

If you are specifically talking about football, then you'll have "O escanteio".