Which 2011 Grand Prix did Jenson Button win after a long rain delay?

Jenson Button won the 2011 Canadian Grand Prix after a lengthy rain delay.

The race was held at Circuit Gilles Villeneuve in Montreal on 12 June 2011. Torrential rain forced a red-flag suspension lasting more than two hours, making the event the longest race in Formula One history by elapsed time. Once racing resumed, changing conditions produced repeated tyre and strategy shifts.

Button started seventh and endured an eventful afternoon. He collided with teammate Lewis Hamilton early in the race, received a drive-through penalty for speeding behind the safety car, and at one point fell to 21st place. He recovered through the field, passed Michael Schumacher for second, and overtook Sebastian Vettel on the final lap to win.

The Japanese, British and Belgian Grands Prix were also won by Button during his career, which can make them tempting alternatives. However, the combination of the extraordinary rain suspension, multiple safety-car periods and his last-lap pass uniquely identifies Canada in 2011.