Mail carriers from the German postal service act as Cupid, delivering 50 to 60 letters to the knothole each month. They must climb a ladder to reach the arboreal mailbox about 3 meters (10 feet) up the 25-meter (82-foot) -tall tree that's more than 500 years old.
Visitors to the tree can leaf through the missives, some of which are mailed from other continents, and choose whether to become postal paramours with any of the letter-writers.
"The resulting pen pal relationships have even led to a few marriages," the postal service says.
The oak was first used as a waystation between a forester's daughter and a chocolate manufacturer from Leipzig, according to the postal service. The forester initially opposed the courtship, so the couple left love letters for each other in the knothole.
They ultimately married, with the forester's permission, under the oak's leaves in 1892.
Send your own love letter to: Bräutigamseiche, Dodauer Forst, 23701 Eutin, Germany.
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Dazio reported from Berlin.
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