Gjennomsnittlig GPS-koordinater for postnummer 20921: 3.412, 99.043
Notering byer:
>> Sei Bamban 20921, North Sumatra, Serdang Bedagai, GPS-koordinater: 3.412,99.04283
Notering byer:
>> Sei Bamban 20921, North Sumatra, Serdang Bedagai, GPS-koordinater: 3.412,99.04283