Shortly before 5.45pm on Tuesday 19 July 2016 police were called to reports that a body was in the River Etherow near to Broadbottom Road, Hyde.
Officers attended and the body of a 16-year-old boy was found.
There are no suspicious circumstances surrounding his death.
Detective Inspector Andy Sandiford of GMP’s Tameside borough, said: “We have launched an investigation into this tragic incident which appears to have begun with a group of friends playing in the river on a hot summer’s day.
“While we don’t yet know for sure what happened, we understand the water appeared calm and shallow, but there may have been strong undercurrents and hidden hazards beneath the surface.
“A team of detectives are investigating the incident and have concluded that there are no suspicious circumstances surrounding the boy’s death.
“The family of the boy are being supported by specially trained officers during this difficult time.”