Anser albifrons
Orange legs and all pink bill without markings. Adults with white bill base and black markings on belly. Juveniles lacking those characters. Body shape and head more angular than other geese. Could be confused with Lesser White-fronted Goose, but Lesser have an obvious yellow eye-ring, and much more white around bill base. Wings more narrow than other grey geese.
Similar to Bean- and Greylag Goose, but higher pitched, more musical, often disyllabic and with a laughing quality. Far from as high pitched as Lesser White-fronted Goose.
Wikipedia: map (se also Xeno-canto below)
Birdlife ecology
Sounds:Recorded by Volker Arnold,http://www.xeno-canto.org ,CC license