Argentina (B), Bolivia (B), Brazil (NB), Chile (B), Paraguay (B), Peru (B), Uruguay (NB).
Vagrant to Ecuador, Falkland Islands (Malvinas).
Central Peru southwards through Andes to Tierra del Fuego; extends eastwards to southern Brazil and Uruguay.
 
Population
Estimated population is 200,000 (2010) and decreasing.
Status NT
Degradation of breeding sites through excessive water extraction, mining, hunting and egg-collection are the main threats.
For more information see BirdLife International Species Factsheet.