Goddess of the River Shannon and granddaughter of Lir (2), the sea-god. In her best-known story Sinann goes to Connla's Well (sometimes the Well of Cóelrind) seeking esoteric knowledge. Apparently because she has violated certain protocols, Sinann is denied knowledge. Instead, the well in its anger rises up and drowns her, her body washing up on the banks of a river, the Shannon, which is then named for her. A nearly identical story is told about Boand [the Boyne] at the Well of Segais, which may be identified with Connla's Well.