Latitudes and Longitudes
| Seaport Name | Seaport Code | Country | Latitude | Longitude |
|---|---|---|---|---|
| Amagr | JPKSM | Japan | 35°54'N | 140°01'E |
| Nishihara | JPNHR | Japan | 26°14'N | 127°50'E |
| Takasago | JPTSG | Japan | 34°44'N | 134°47'E |
| Akitsu | JPAKT | Japan | 34°20'N | 132°24'E |
| Naha | JPNAH | Japan | 26°12'N | 127°39'E |
| Shimonoseki | JPSHS | Japan | 33°57'N | 130°57'E |
| Aioi | JPAIO | Japan | 34°46'N | 134°26'E |
| Kin Wan | CNKWN | Japan | 26°22'N | 127°57'E |
| Shimizu | JPSMZ | Japan | 35°01'N | 138°30'E |
| Muroran | JPMUR | Japan | 42°20'N | 140°57'E |
| Heianza Island | JPHEI | Japan | 26°21'N | 127°56'E |
| Sakai | JPSAK | Japan | 34°34'N | 135°26'E |
| Kushiro | JPKUH | Japan | 42°58'N | 144°20'E |
| Heianza | JPHEI | Japan | 26°21'N | 127°56'E |
| Owase | JPOWA | Japan | 34°04'N | 136°14'E |
| Hakodate | JPHKD | Japan | 41°47'N | 140°41'E |
| Chimuwan | CNKWN | Japan | 26°22'N | 127°57'E |
| Osaka | JPHAN | Japan | 34°39'N | 135°25'E |
| Buckner Bay | JPNHR | Japan | 26°14'N | 127°50'E |
| Onogawa | JPONG | Japan | 38°27'N | 141°27'E |