So... is Tales of Eternia The Animation finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 26, 2001
Manga finished: February 25, 2006
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Rid Hershel and his friends, Farah, Keel, and Meredy, are on a quest to stop a major disaster known as the Grand Fall.
Having already secured three powerful spirits, their journey takes an unexpected turn when Rid is captured by a bounty hunter.
Forced to detour to a remote archipelago, the group finds themselves facing a new and pressing danger that threatens their world.