Difference between "sana" & "situ".
"sana" is farther away from the speaker.

The definition according to KBBI :
https://kbbi.web.id/sana

sana 1/sa·na/ pron penunjuk tempat yang jauh (atau dianggap jauh) dari pembicara:

Indicates a location that is far (or considered to be far) from the speaker.

The definition according to KBBI :
https://kbbi.web.id/situ

situ 1/si·tu/ pron (petunjuk) tempat yang tidak jauh dari pembicara:

Indicates a location that is not far from the speaker.

Both are acceptable. When learning Cebano these two words were dependent upon distance, situ being nearby but not here, sana being further away. I believe this is also the case with Indo, however, some explanation focus more on situ being a more defined location, sana a general direction, and other explanations focus on situ being informal and sana as formal, but I think that is simple because location is not as clear outside of spoken sentences. Use either.