From Bulbapedia, the community-driven Pokémon encyclopedia.
The Sea Temple, Samiya (Japanese: アクーシャ Akusha)—Akusha in VIZ Media's translation of the manga, and Samaya in Chuang Yi's manga translation—is an underwater palace built by the People of the Water. It has a complex structure and holds the Sea Crown in its depths.
The People of the Water built the temple where the Manaphy lived. All Manaphy have homing instincts that guide them to the temple even though it has a cloaking device. Though it cannot be seen regularly, as it blends in with the water, it will appear visibly under the red moonlight of a lunar eclipse. It floats around with the current presently, but used to stay put.
During the events of Pokémon Ranger and the Temple of the Sea, the temple started to sink when Phantom pulled crystals out of the Sea Crown. Fortunately, it returned to normal after the crystals were placed back in the Sea Crown.
Official maps of the Pokémon world clearly show it being located near Kanto, but during the movie it is actually south of Cherrygrove City, which is situated in the Johto region. However, considering how the movie states that it moves with the current, that could just as easily have been the current location of it.
In the TCG
This listing is of cards mentioning or featuring Samiya or Pokémon that reside there and the surrounding sea in the Pokémon Trading Card Game.
In the manga
Samiya in W Mission Story: Pokémon Ranger - the Comic
In the W Mission Story: Pokémon Ranger - the Comic manga
Samiya appears in the manga W Mission Story: Pokémon Ranger - the Comic, where it is simply referred to as the Temple of the Sea.
The temple is the desire of the Go-Rock Quads, who want the Sea Crown so that they can rule the world. In order to find it, they stole a Manaphy Egg that they planned to hatch and have it lead them to it.
|| アクーシャ Akusha
|| From aqua and 社 sha (society).
|| Literally means "sea temple".
| Chinese (Mandarin)
|| 亞克夏 Yàkèxià
|| Transliteration of its Japanese name.