I used to think the longest place name was a Welsh town called:
Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch
or Llanfair PG for short, but apparently there's a hill in New Zealand named:
Taumatawhakatangihangakoauauotamateaturipukakapikima-
ungahoronukupokaiwhenuakitanatahu
and the name of Bangkok in Thai is:
Krungthepmahanakonbowornratanakosinmahintarayudyaya-
mahadiloponoparatanarajthaniburiromudomrajniwesmahasa-
tarnamornpimarnavatarsatitsakattiyavisanukamphrasit
All this is totally irrelevant to the puzzle (honest), but I wanted to put something there other than "Puzzle Cache". So the coordinates are:
0 12 14 7 7 12 16 10 1 5 5 3 9 6 8
You can validate your puzzle solution with certitude.