Aleya (or marsh ghost-light) is the name given to a strange light phenomena occurring over the marshes as observed by Bengalis, especially the fishermen of Bangladesh and West Bengal. This marsh light is attributed to some kind of marsh gas apparitions that confuse fishermen, make them lose their bearings, and may even lead to drowning if one decided to follow them moving over the marshes. Local communities in the region believe that these strange hovering marsh-lights are in fact Ghost-lights representing the ghosts of fisherman who died fishing. Sometimes they confuse the fishermen, and sometimes they help them avoid future dangers.