Kardiotissa (Greek: Καρδιώτισσα), anciently, Lagusa or Lagousa (Ancient Greek: Λάγουσα) or Lagussa or Lagoussa (Λαγοῦσσα),[1] is a Greek island in the Cyclades.

It is uninhabited and administratively a part of the island community of Sikinos.

It lies midway between that island and the island of Folegandros.

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