The term
summerland(often, summerlands) originated in the late nineteenth century spiritualist circles as a descriptive for the afterlife. The summerlands were variously described as a heaven-like place existing either astrally or in the depths of space, as a place for the instruction of spirits after death or in some cases, as a place of rest and refreshment before reincarnation.
The concept Summerland is now best known via its adoption by the Neopagan movement, where it is interpreted individually, most often as an afterlife paradise, but often just as a metaphor for the unknown.