According to Gwent Police, a beige Skoda Octavio crashed on Brook Row in Fochriw, Caerphilly county, at around 5.05 a.m. on Sunday.
Firefighters and ambulances responded, but the 17-year-old girl from Mountain Ash died at the scene.
A 21-year-old Rhymney man has been arrested on suspicion of causing death by dangerous driving and driving while intoxicated.
Brook Row is currently closed to traffic, with detours in place.
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