The Simbi's deep association with springs, rivers and still water reflects a specific and well documented feature of traditional Kongo cosmology from Central Africa: the concept, discussed at length by scholars of Kongo religion such as the art historian Robert Farris Thompson, of kalunga, the boundary or barrier, often visualized as a body of water, that separates the world of the living from the world of the dead and the ancestors.
In this understanding, water is not simply a resource or a landscape feature but a genuine spiritual threshold, a mirror-like surface across which the living and the dead can, under the right ritual conditions, communicate or even exchange places, and spirits associated with springs and pools are naturally positioned as guardians and mediators of exactly this crossing. This Kongo cosmological framework, carried to the Americas by enslaved Bakongo people and their descendants, shaped religious traditions across the African diaspora far beyond Haiti alone, leaving traces in related concepts found in Kongo-influenced practices elsewhere in the Caribbean and in the American South, and it provides the deeper logic behind the Haitian Simbi's particular character: aloof, secretive, and positioned at watery boundary-places precisely because those places are, in the inherited Kongo understanding they carry forward, boundary-places between the human world and the world beyond it. Understanding the Simbi this way connects a specific family of Haitian lwa back to a coherent, documented Central African religious philosophy about water, rather than treating their association with springs and rivers as an isolated or arbitrary feature of Haitian tradition alone.