Sinann was a goddess in ancient Celtic mythology associated with the river Shannon which is named after her. She was originally a mortal woman who searched for the Well of Knowledge. In this well lived the Salmon of Knowledge. They were made knowledgeable by eating the nuts that fell from nine magical hazel trees. When she found it, in Northern Ireland, she opened the cover and the water flowed out and became the river Shannon. As the water overflowed it killed her and transformed her into the goddess Sinann.

Another story about Sinann said that she was a slayer of sea monsters. She had a temple on the island of Inis-Cathaig.
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