Learn Portuguese (Portugal): Escorrego na lama, embora tenha botas. - I slip in the mud, even though I have boots.

The word embora (meaning "although" or "even though") is a concessive conjunction. In Portuguese, embora always forces the following verb into the subjunctive mood. That is why we must use the present subjunctive tenha instead of the present indicative tenho.

I thought the subjunctive was for doubt. Why use it if I know for a fact that I have boots?

While the subjunctive usually expresses doubt, emotion, or uncertainty, certain trigger words require it no matter what. The word embora is one of those strong triggers. It always takes the subjunctive, regardless of how certain you are about the fact you are stating.

I've heard embora used when people are leaving. Is it the same word here?

It is the exact same word, but with a completely different function. When paired with the verb ir (to go), as in the phrase ir embora, it means "to leave" or "to go away". However, when used by itself to connect two parts of a sentence, as it is here, embora is a conjunction meaning "although" or "even though".

Why does the translation say "in the" when the Portuguese sentence just says na lama?