北京每个三区交界处会立一到三块三棱柱体的石碑，这出三区交界处有两块碑，分别在护城河两岸，宝在河北岸的三界碑处，是一个微型塑料袋，有磁性At the junction of three administrative districts in Beijing, there are usually one to three triangular stone monuments. At this particular tri-district junction, there are two monuments located on opposite sides of the city moat. The cache is hidden at the “Three-District Boundary Monument” on the north bank — a tiny magnetic plastic bag.
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