The Santry River then enters Raheny near the beginning of Tonlegee Road, flowing alongside the Edenmore lands, past St. Joseph's Hospital, through the village centre, alongside the grounds of Manor House School, and then, with two areas of culverting, at the beginning and end of the former Bettyglen Estate, reaches the sea, where its mouth forms part of the eastern "lagoon" behind North Bull Island, and the flow enters Sutton Creek. The lower stretch of the river is occasionally noted as "Raheny River."