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Where was Tech Duinn believed to be located?
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Celtic religion
Celtic cross.
In the context of Celtic religion, Tech Duinn was believed to be located on or under Bull Island, situated off the Beare Peninsula in Ireland.1
As the realm of Donn, the god of the dead and the ancestor of all the Irish, Tech Duinn served as the destination to which all people were thought to return after death, with the exception of a select few.1