A double green, with fairways approaching from two different directions (top and bottom), at Carnoustie in Scotland.
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A very large green that serves as the green for two different holes on the golf course. Double greens have two holes and two flagsticks, and are large enough to accommodate two different groups of golfers playing the green simultaneously (each playing their own hole, of course).
Double greens occasionally show up on parkland-style courses. But while they are not common anywhere, they are much more likely to be found in older, links courses of Great Britain and Ireland. On The Old Course at St. Andrews, for example, all but four holes end in double greens.