Translation:We are facing north, the south is behind us.
Unless I'm missing something, the 'the' is not necessary for a translation of this sentence
yes, this must be very confusing for learners of english, that this is a relatively rare occasion when an article is not actually required. though, it's not strictly wrong to include it.
but i naturally omit the article for directions and so keep getting marked wrong. adding my bit here, in the hope that this discussion will come to the attention of the course admin and they will allow either option.