Geo-riddle Redux Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(micro)
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The posted coordinates are halfway between the edges of a field, but you won't find a cache there. To find the cache, you must use your knowledge of geolocation to answer a riddle.
What's halfway between N 39.372, W 121.206 and N 38.870, W 121.705? (answer is a keyword of seven letters)
You can validate your puzzle solution with certitude.
This cache was featured on teamajk's Geocaching Puzzle of the Day blog on August 23, 2018.
Additional Hints
(Decrypt)
Guvf pnpur vf na rnfvre pbhfva gb gur abj-nepuvirq TP5EP9U. Svany ybpngvba vf jrfg bs gur fvqrjnyx.