Peklo (also spelled Piekło) is a concept from Slavic mythology, which refers to the underworld or the realm of the dead. It is often portrayed as a dark and gloomy place, where souls go after death to be judged and punished for their actions in life.

In Slavic mythology, Peklo is ruled by Veles, and is said to be a place of eternal suffering for the souls of the wicked. The souls of the righteous, on the other hand, are believed to go to a place of eternal peace and happiness, such as the afterlife realm of Nav.

Peklo is often depicted as a place of fire and darkness, where souls are punished for their sins. The souls of the wicked are said to be tortured by demons, while the souls of the righteous are said to be rewarded with eternal peace and happiness.

In some Slavic cultures, Peklo is also considered a symbol of the fear of death and the afterlife. It represents the idea that death is not the end, and that our actions in life have consequences that extend beyond the grave.

In modern times, the concept of Peklo is not as prevalent as it was in the past. But it is still remembered in Slavic folklore and literature, and has been referenced in a variety of works of literature and popular culture.