Which nymph keeps Odysseus on her island for seven years?

The nymph who keeps Odysseus on her island for seven years is Calypso. In Homer's Odyssey, she lives on the remote island of Ogygia and takes Odysseus in after a shipwreck, but does not allow him to continue his journey home.

Calypso falls in love with Odysseus and offers him an extraordinary life, even promising immortality if he remains with her. Odysseus, however, longs for Ithaca, his wife Penelope, and his former life. The poem portrays him spending his days grieving by the shore despite the comforts of Calypso's island.

Athena asks Zeus to intervene, and Zeus sends Hermes to order Calypso to release him. Reluctantly, she helps Odysseus build a raft, supplies food and clothing, and gives him favorable winds. Calypso is sometimes confused with Circe, another powerful woman Odysseus meets, but Circe keeps him on her island for about a year, not seven years.