Gjennomsnittlig GPS-koordinater for postnummer 21151: 1.967, 98.783
Notering byer:
>> Siantar 21151, North Sumatra, Simalungun, GPS-koordinater: 1.96672,98.78338
Notering byer:
>> Siantar 21151, North Sumatra, Simalungun, GPS-koordinater: 1.96672,98.78338