I don't think Duolingo will add it. It isn't standard grammar.
The literal meaning of "the" is closed to "tersebut". But you could use "itu" as alternative (the compatibility is almost 100%)
Tersebut = ter + sebut. Literally means called, mentioned, said, ... so it means something that is known.
"Itu" literally means that. "That" here refers to something that is known.
If you want to stress the distance (that is far), use "itu".