The teenage girl died when the car she was driving left the road at Kilaldry Bridge in Kilmoyler and entered the River Aherlow.
Two people have lost their lives in separate collisions in the South East in the last twenty-four hours.
A teenage girl has died following a single vehicle collision in Tipperary, while a woman in her 50s died in a crash involving a car and a lorry in Kilkenny.
The teenage girl died when the car she was driving left the road at Kilaldry Bridge in Kilmoyler and entered the River Aherlow.
Her body was recovered from the water this morning by members of the Garda Water Unit, and has been removed to the mortuary, where a post mortem exam is due to take place.
Meanwhile, in a separate incident, a woman in her 50s has died following a collision on the N25 near Glenmore, Kilkenny.
The collision, involving a lorry and a car, occurred around 10:30 am this morning.
The driver of the car, a woman in her 50,s was pronounced dead at the scene.
Gardai are appealing for any witnesses to either collision to contact them.

SSE Airtricity Customers To See Gas And Electricity Price Hikes From October
Russian Ambassador Says Irish Government "Cannot Be Treated As A Friendly One"
Two People Arrested In Connection With Shooting Near Dublin Shopping Centre
New Report Shows House Prices Are 17% Overvalued
Boy Dies After Train Collides With Car In Mayo
E-Scooter Ban For Under 18s Could Be In Place By October
Teenager Charged After Alleged Wrong-Way Driving Incident In Cork City
9.1% Increase In Rent For New Tenancies