Ringed into the southeast corner of California by mountain ranges, deserts, Baja California and the Colorado River, the Imperial Valley has historically been regarded a little like California’s appendix: mostly quiet and forgotten until it flares up to cause a hell of a pain.

Unemployment here is the worst in the Golden State. The Salton Sea, a man-made lake that became a postcard-worthy exemplar of cabana living during the 1950s, is now a much-cited case study in environmental degradation.

People who live here take pride in a kind of pugnacious, underdog spirit. But until hometown boy Andy Ruiz Jr. walloped the heavyweight champ at Madison Square Garden, this wasn’t a place you’d find as the setting for a Rocky Balboa tale.

Boxers of Mexican descent have had a storied history in the sport, but never before had one done what Ruiz, 29, accomplished: becoming the first fighter of Mexican descent to hold a belt in the sport’s prestige division. Making the victory more improbable was the stark contrast between Ruiz — big, beefy, like someone who just stepped out of a Fernando Botero painting — and his immaculately sculpted foe.

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