Navigatio Brendani 6.7:

    vīdērunt rīpam altissimam sīcut mūrum, et dīversōs rīvulōs dēscendentēs dē summitāte īnsulae, fluentēs in mare.

    It has been argued that island that best fits the description is Vagar, which has both cliffs and rivulets.

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