Vilenica Prize

Vilenica International Literary Festival (Slovene: Mednarodni literarni festival Vilenica) is a festival dedicated to literature that was founded in 1986 in Slovenia. It takes place annually in several locations on the Karst Plateau in the Slovene Littoral, including inside Vilenica Cave. It is arranged by the Slovene Writers' Association together with the Cultural Centre Vilenica from Sežana. The highlight of the festival is the awarding of the Vilenica International Literary Prize to a Central European author for "outstanding achievements in the field of literature and essay writing."

From the Wikipedia article “Vilenica International Literary Festival”, licensed under CC BY-SA 4.0.

Check the official rules of the Vilenica Prize for the current eligibility window, accepted formats, residency or language requirements and any entry fee. For most established prizes the publisher submits on the author's behalf, often with a limit on entries per imprint.

If you are self-published, look for an explicit statement that independently published books are accepted, and budget for entry fees and copies for judges.