Koidu (Viljandi Koān)
Koidu sī chi̍t ê tī Estonia Kiōng-hô-kok Viljandi Koān Viljandi Kàu-khu ê chng-thâu (küla).
| Koidu | |
| — Chng-thâu — | |
  Koidu |
|
| Keng-hūi-tō͘: 58°14′59″N 25°49′42″E / 58.24972°N 25.82833°E | |
| Kok-ka |  Estonia
|
|---|---|
| Koān | Viljandi |
| Chū-tī-thé | Viljandi Kàu-khu |
| Jîn-kháu | |
| - Lóng-chóng | 77 lâng |
| Sî-khu | EET (UTC+2) |
| - Jo̍at--lâng | EEST (UTC+3) |