The Elvish refuge founded by Elrond in J.R.R. Tolkien’s works is Rivendell.
Rivendell, also called Imladris, is a hidden valley east of the Misty Mountains. Elrond establishes it in the Second Age after the destruction of Eregion during Sauron’s war against the Elves. Its protected location allows it to become a refuge for Elves, travelers, and enemies of Sauron.
Bilbo reaches Rivendell during the journey in The Hobbit, and Frodo is taken there after being wounded by a Nazgûl. Elrond later hosts the Council of Elrond, where representatives debate the fate of the One Ring and form the Fellowship.
Rivendell is distinct from Lothlórien, the woodland realm ruled by Galadriel and Celeborn. Gondolin is a hidden Elvish city of the First Age, while Eregion was the Second Age land where many Rings of Power were made. These places belong to related but different periods and histories.