The kingdom of Tamna or Tamna guk ruled Jeju Island from ancient times until it was absorbed by the Korean Joseon Dynasty in 1404. This kingdom is also sometimes known as Tangna (탁라), Seomna (섭나), and Tammora (탐모라). All of these names mean "island country".

Tâmna is a commune located in Mehedinți County, Romania. It is composed of eleven villages: Adunații Teiului, Boceni, Colareț, Cremenea, Fața Cremenii, Izvorălu, Manu, Pavăț, Plopi, Tâmna and Valea Ursului.