The prefecture which contains Tsukuba.
Ibaraki includes:
Bando | Chikusei | Hitachi | Hitachinaka | Hitachi-Omiya | Hitachiota | Inashiki | Ishioka | Itako | Kasama | Kashima | Kasumigaura | Kitaibaraki | Koga | Mito (capital) | Mitsukaido | Moriya | Naka | Ryugasaki | Shimotsuma | Takahagi | Toride | Tsuchiura | Tsukuba | Ushiku | Yuki
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