Montgomerie congratulates Siem while Langer looks on
-16 Germany (Langer/Siem)*, Scotland (Montgomerie/Warren)
-15 Sweden (Stenson/Pettersson)
-14 South Africa (Sabbatini/Sterne)
-13 Argentina (Cabrera/Romero), Spain (Jimenez/Fernandez-Castano), US (Cink/Henry)
* Germany won at first extra hole
German pair Bernhard Langer and Marcel Siem held their nerve to beat Scottish duo Colin Montgomerie and Marc Warren in a play-off to claim the World Cup.
Both teams finished on 16 under par after 72 holes to set up a thrilling finale at a soaked Sandy Lane course.
Montgomerie holed a clutch par putt at 18 to take the event to sudden death.
Both Langer and Montgomerie then missed the green with their tee shots but Siem's chip left Langer a tap-in while Montgomerie missed from 5ft to bogey.
It was Germany and Langer's second World Cup win, the first coming in 1990 when the Ryder Cup veteran partnered Torsten Gideon to victory in Florida.
The 49-year-old Langer was making his first appearance in the event since 1996 but came into the week in form after partnering his 16-year-old son Stefan to victory in a father/son tournament in Orlando last week.
It just shows that the golf ball doesn't know how old you are!
Stefan also acted as his father's caddie this week and Langer said: "Every trophy is special but the last few years I didn't win a lot.
"It was nice to be on a roll and to win two weeks in a row and have Stefan on the bag is a great experience.
"It's not easy to believe that 16 years later I am still in the winner's circle. It just shows that the golf ball doesn't know how old you are!"
Swedish pair Henrik Stenson and Carl Petterson had led going into the final round but saw their two-shot lead disappear with two bogeys as the Barbados resort was hit by torrential rain.
The downpours forced play to be suspended but when play resumed the Swedes steadied themselves and seemed set to make it a three-way play-off.
[Montgomerie] told me at the end it was a great effort and we couldn't do much more
But they three-putted the last hole to see their challenge end and leave Scotland and Germany to battle it out.
Langer and Siem had set the clubhouse target after combining beautifully in the alternate-shot format for a five-under 66 - their only real error coming at the 17th when Langer missed from 8ft to drop a shot.
But the 2004 Ryder Cup-winning captain immediately hit back with a superb tee shot at the par-three last to give Siem a chance to return to 17 under - a chance he spurned.
The Scots, who carded a 69, also had chances to win the $1.4m first prize in regulation but makeable birdie putts at the 15th and 16th refused to drop.
With darkness closing in at Sandy Lane and Montgomerie already off to catch a plane to Tiger Woods' event in California next week, European Tour rookie of the year Warren was left to sum up his team's disappointment.
"That's the first time I've ever lost a play-off in my career," said the 25-year-old, who won his first European Tour title in sudden death in Sweden earlier this season.
"I know how the other guy feels and it's not a nice feeling, especially in such a big event.
Siem and Langer celebrate Germany's second World Cup win
"I've really seen this week why Monty has won eight Order of Merit titles. From tee to green he is relentless, almost every shot is where he wants to put it and it looks absolutely effortless at times. I can't say enough about him.
"He told me at the end it was a great effort and we couldn't do much more. He is as disappointed as I am.
"We had a great chance to win but unfortunately that didn't happen. It's a shame for Scottish golf but hopefully this will give it a boost anyway."
Sweden finished alone in third with South Africa a shot further back in fourth.
Wales' Bradley Dredge and Stephen Dodd put up a creditable defence of their title before finishing in a tie for eighth with Ireland's Paul McGinley and Padraig Harrington in joint 12th.
Pre-tournament favourites England suffered a disappointing week as Luke Donald and David Howell failed to hit top form and had to settle for a share of 15th.