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1) Mount Everest is called Sagarmatha in Nepal and Qomolangma in China.
2) The sum of ABC + DEF is between 1000 and 1750.
3) ACE-BDF< 30.
4) The cache is big enough for most TBs.
5) ABC divides evenly by 9.
6) DEF divides evenly by 6.
7) Sequoiadendron giganteum is the latin name for the California Big Tree also called Giant Sequoia or Giant Redwood. It is the largest tree in the world by volume.
8) Both ABC and DEF are prime numbers.
9) In 2009 Tomintoul distillery produced the largest bottle of whisky in the world, containing 105.3 litres of 14 year old Tomintoul malt whisky.
10) DE = the product of the numbers of the first four truthful statements in this list.
11) This sentence is true.
12) C = 9
13) Treecreepers are known sometimes to roost in holes they have excavated in the soft wood of Giant Sequoias, usually on the north-east side of the tree.
14) BC = the product of the numbers of the preceding two false statements in this list.
15) ABC>DEF.
16) B, D, and E are the same digit.
17) This sentence is false.
18) You don't have to include a lie in your log. 
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Everything below here is true.
Instructions: Some of the above statements are truthful, while some are lies. If you correctly identify all the lies you can determine the co-ordinates of the cache uniquely.
The background image is from: http://commons.wikimedia.org/wiki/File:White_shark_%28cropped%29.jpg and is used under the Creative Commons Attribution-Share Alike 3.0 Unported license.