Average GPS coordinates for Seikyuujima Postcode location: 35.913, 140.384. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Seikyuujima on map:

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Listing cities & postcodes (1):
>> Ibarakiken, 300-0748 Seikyuujima, Inashikigun'Azumamachi, GPS coordinates: 35.9126,140.384