Gjennomsnittlig GPS-koordinater for postnummer 21157: 3.178, 98.865
Notering byer:
>> Silou Kahean 21157, North Sumatra, Simalungun, GPS-koordinater: 3.17817,98.8648
Notering byer:
>> Silou Kahean 21157, North Sumatra, Simalungun, GPS-koordinater: 3.17817,98.8648