.10 mile limit
From Cacheopedia
The .10 mile limit is a cache placement guideline on geocaching.com. In order to prevent over-saturation of an area, new caches must be placed ar least 0.1 miles from existing caches, including stages of existing multicaches.
Exceptions to the guideline may be allowed, such as for caches on opposite sides of a river, or the top and bottom of a cliff.
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