This is a series of 100 caches, in and around the Chilterns. Most of the footpaths are good, some good enough for buggies. Some of the bridleways are good enough for biking. I'll try to describe any obstacles along the way. But I can tell you, although I'm a keen biker, when the time comes to do maintenance of these caches, I'll be on foot.

There are three osculating rings; you'll be able to walk any one of them, or all three. I've called it "The Chiltern Hundred" because there are, guess what, a hundred of them. This means that you can try to do them all in one day, and add your name to the roster of "100-a-day cachers". Email me if you achieve this, and I'll do a "Hall of fame" (let me know how long it took you). Actually, there's 109, because at any one time, I'd expect a few of them to be out of action. Or maybe a few you find too difficult.

Caches are there to be found, so none of them are horribly difficult. You might need to scramble up a steep bank, stand on a stile, or get a few feet up into a tree. But my feeling is, if I can do it, anyone can - I'm not exactly athletic. I'm about six feet tall; if you're a lot less than that, you'll have to climb a bit further than I did.

Most of the containers are 330 ml screw-top beakers. Some of them are somewhat smaller than that, about twice the size of a 35mm container, ok for small swaps, TBs and coins.

Initially, I put in a very bright keyring torch, a finger torch (red, green, blue or white) and one other item. The third item is a compass, or a whistle/compass/thermometer, or a thermometer/compass, or an electronic mosquito repeller, or some other item.

In each log book, there's a letter and a value. Obviously, you should note these down, in order to go for the Golden Bonus.

The hides are mostly easy, although a few are up trees. There's no "pile of sticks" or "pile of rocks" hides. And there's very little ivy. None of the caches are micros. There's hints for all the hides; caches are there to be found. But some of them are cunningly hidden.

Here's a map of the area, showing the location of the caches. This will help you plan your route.

Bring a pencil. I didn't put pencils in any of the caches. A cacher without a pencil is like a fish without a bicycle.

Three Rings for the Elven-kings under the sky,

Seven for the Dwarf-lords in their halls of stone,

Nine for Mortal Men doomed to die,

One for the Dark Lord on his dark throne

In the Land of Mordor where the Shadows lie.

One Ring to rule them all, One Ring to find them,

One Ring to bring them all and in the darkness bind them

In the Land of Mordor where the Shadows lie.

There's three Rings. The largest (49 caches) is the Chesham Ring. The other two are the Asheridge Ring (33 caches) and the Chartridge Ring (27 caches).

The Three Rings touch, each with the other two. So you can, in one roundwalk, do one, or any two, or all three Rings. In that scenario, it's the One Ring.

Here's where you can leave one of the rings, spin round another, and then come back to the ring you were on before.

- ch032 on the Chesham Ring is close to ch075 on the Asheridge Ring
- ch098 on the Chartridge Ring is close to ch043 on the Chesham Ring
- ch052 on the Asheridge Ring is close to ch083 on the Chartridge Ring

You can start it anywhere, but the obvious place is at number one, which is near Chesham tube station. You can get there by travelling out along the Metropolitan line. If you come by car, there's a pay car park at the station, and a bigger car park down in Chesham, serving the supermarkets. There's also lots of free parking; for exmple, at N 51 ° 42.527 W 000 ° 36.529. If you want to start anywhere else around the ring, there's lots of places that I found to park. Just drive along a road, you'll soon find somewhere.

Legend has it that if thirteen virgins walk round this ring in a single day, then the river Chess will rise and inundate Chesham, the Dark Tower will fall, and peace will reign in the Lands of Mortal Man. Here's everything you ever wanted to know about Chesham

You should be able to walk the whole Chesham Ring in less than ten hours.

- CH 001 N 51 ° 42.319 W 000° 36.682 GC1EB13
- CH 002 N 51 ° 42.212 W 000° 36.678 GC1ECHA
- CH 003 N 51 ° 42.183 W 000° 36.474 GC1ECHG
- CH 004 N 51 ° 42.400 W 000° 35.975 GC1ECKY
- CH 005 N 51 ° 42.404 W 000° 35.763 GC1ECMN
- CH 006 N 51 ° 42.144 W 000° 35.991 GC1ECMY
- CH 007 N 51 ° 42.216 W 000° 35.789 GC1ECN1
- CH 008 N 51 ° 42.249 W 000° 35.621 GC1ECN6
- CH 009 N 51 ° 42.281 W 000° 35.462 GC1ECNJ
- CH 010 N 51 ° 42.353 W 000° 35.316 GC1ECNQ
- CH 011 N 51 ° 42.421 W 000° 35.160 GC1ECNY
- CH 012 N 51 ° 42.631 W 000° 35.100 GC1ECP9
- CH 013 N 51 ° 42.756 W 000° 35.163 GC1ECPK
- CH 014 N 51 ° 42.846 W 000° 35.244 GC1ECPV
- CH 015 N 51 ° 42.942 W 000° 35.326 GC1ECQ3
- CH 016 N 51 ° 43.026 W 000° 35.469 GC1ECQ6
- CH 017 N 51 ° 43.124 W 000° 35.527 GC1ECQ9
- CH 018 N 51 ° 43.262 W 000° 35.467 GC1ECQC
- CH 019 N 51 ° 43.382 W 000° 35.538 GC1ECQM
- CH 020 N 51 ° 43.504 W 000° 35.668 GC1ECQQ
- CH 021 N 51 ° 43.585 W 000° 35.748 GC1ECR3
- CH 022 N 51 ° 43.655 W 000° 35.922 GC1ECR7
- CH 023 N 51 ° 43.664 W 000° 36.081 GC1ECRA
- CH 024 N 51 ° 43.677 W 000° 36.238 GC1ECRF
- CH 025 N 51 ° 43.726 W 000° 36.416 GC1ECRK
- CH 026 N 51 ° 43.770 W 000° 36.651 GC1ECRQ
- CH 027 N 51 ° 43.839 W 000° 36.820 GC1ECRX
- CH 028 N 51 ° 43.813 W 000° 36.997 GC1ECT1
- CH 029 N 51 ° 43.765 W 000° 37.153 GC1ECTB
- CH 030 N 51 ° 43.715 W 000° 37.414 GC1ECTH
- CH 031 N 51 ° 43.552 W 000° 37.377 GC1ECTM
- CH 032 N 51 ° 43.517 W 000° 37.589 GC1EHD8
- CH 033 N 51 ° 43.418 W 000° 37.561 GC1EHDJ
- CH 034 N 51 ° 43.334 W 000° 37.590 GC1EHDQ
- CH 035 N 51 ° 43.234 W 000° 37.767 GC1EHDV
- CH 036 N 51 ° 43.172 W 000° 37.604 GC1EHDY
- CH 037 N 51 ° 43.107 W 000° 37.757 GC1EHE7
- CH 038 N 51 ° 43.118 W 000° 37.954 GC1EHE8
- CH 039 N 51 ° 42.932 W 000° 37.947 GC1EHEC
- CH 040 N 51 ° 42.828 W 000° 37.911 GC1EHEF
- CH 041 N 51 ° 42.743 W 000° 37.815 GC1EHEN
- CH 042 N 51 ° 42.609 W 000° 37.663 GC1EHEX
- CH 043 N 51 ° 42.458 W 000° 37.572 GC1EHF2
- CH 044 N 51 ° 42.409 W 000° 37.361 GC1EHF8
- CH 045 N 51 ° 42.373 W 000° 37.223 GC1EHFC
- CH 046 N 51 ° 42.425 W 000° 37.018 GC1EHFH
- CH 047 N 51 ° 42.270 W 000° 36.886 GC1EHFQ
- CH 048 N 51 ° 42.395 W 000° 36.881 GC1EHFW
- CH 049 N 51 ° 42.443 W 000° 36.578 GC1EHG0

Legend has it that if thirteen virgins walk round this ring in a single day, then the landlord at the Bell at Chartridge will give them a free beer each. Here's everything you ever wanted to know about Asheridge

You should be able to walk the whole Asheridge Ring in less than six hours.

- CH 050 N 51 ° 43.372 W 000° 38.800 GC1ER4K
- CH 051 N 51 ° 43.431 W 000° 39.030 GC1ER4Y
- CH 052 N 51 ° 43.453 W 000° 39.200 GC1ER56
- CH 053 N 51 ° 43.556 W 000° 39.687 GC1ER5C
- CH 054 N 51 ° 43.667 W 000° 39.897 GC1ER5E
- CH 055 N 51 ° 43.740 W 000° 39.790 GC1ER5H
- CH 056 N 51 ° 43.876 W 000° 39.727 GC1ER5M
- CH 057 N 51 ° 43.954 W 000° 39.646 GC1ER5R
- CH 058 N 51 ° 44.068 W 000° 39.565 GC1ER65
- CH 059 N 51 ° 44.183 W 000° 39.410 GC1ER69
- CH 060 N 51 ° 44.299 W 000° 39.336 GC1ER6J
- CH 061 N 51 ° 44.415 W 000° 39.213 GC1ER6P
- CH 062 N 51 ° 44.482 W 000° 39.073 GC1ER6W
- CH 063 N 51 ° 44.533 W 000° 38.917 GC1ER71
- CH 064 N 51 ° 44.444 W 000° 38.820 GC1ER73
- CH 065 N 51 ° 44.344 W 000° 38.733 GC1ER79
- CH 066 N 51 ° 44.224 W 000° 38.464 GC1ER7D
- CH 067 N 51 ° 44.314 W 000° 38.379 GC1ER7J
- CH 068 N 51 ° 44.362 W 000° 38.188 GC1ER7P
- CH 069 N 51 ° 44.338 W 000° 38.030 GC1ER7W
- CH 070 N 51 ° 44.258 W 000° 37.919 GC1ER84
- CH 071 N 51 ° 44.106 W 000° 38.024 GC1ER87
- CH 072 N 51 ° 44.042 W 000° 37.900 GC1ER8B
- CH 073 N 51 ° 43.879 W 000° 37.805 GC1ER8F
- CH 074 N 51 ° 43.787 W 000° 37.684 GC1ER8K
- CH 075 N 51 ° 43.618 W 000° 37.622 GC1ER8P
- CH 076 N 51 ° 43.619 W 000° 37.818 GC1ER8W
- CH 077 N 51 ° 43.629 W 000° 37.971 GC1ER92
- CH 078 N 51 ° 43.613 W 000° 38.110 GC1ER95
- CH 079 N 51 ° 43.651 W 000° 38.262 GC1ETMH
- CH 080 N 51 ° 43.581 W 000° 38.347 GC1ETMK
- CH 081 N 51 ° 43.511 W 000° 38.457 GC1ETMP
- CH 082 N 51 ° 43.417 W 000° 38.567 GC1ETMR

Legend has it that if thirteen virgins walk round this ring in a single day, then the Gabriel will blow his trumpet and we'll all find out which religion we should have subscribed to.

Here's everything you ever wanted to know about Chartridge

You should be able to walk the whole Chartridge Ring in less than four hours.

- CH 083 N 51 ° 43.446 W 000° 39.416 GC1ETVD
- CH 084 N 51 ° 43.448 W 000° 39.737 GC1ETVN
- CH 085 N 51 ° 43.412 W 000° 39.942 GC1ETVY
- CH 086 N 51 ° 43.348 W 000° 40.090 GC1ETW4
- CH 087 N 51 ° 43.043 W 000° 40.156 GC1ETWA
- CH 088 N 51 ° 42.947 W 000° 40.105 GC1ETWC
- CH 089 N 51 ° 42.848 W 000° 40.066 GC1ETWM
- CH 090 N 51 ° 42.765 W 000° 39.949 GC1EW7K
- CH 091 N 51 ° 42.760 W 000° 39.780 GC1EW7X
- CH 092 N 51 ° 42.745 W 000° 39.514 GC1EW82
- CH 093 N 51 ° 42.697 W 000° 39.128 GC1EW82
- CH 094 N 51 ° 42.655 W 000° 38.858 GC1EW8A
- CH 095 N 51 ° 42.637 W 000° 38.662 GC1EW8M
- CH 096 N 51 ° 42.609 W 000° 38.476 GC1EW8T
- CH 097 N 51 ° 42.561 W 000° 38.086 GC1EW8Y
- CH 098 N 51 ° 42.506 W 000° 37.889 GC1EW9B
- CH 099 N 51 ° 42.810 W 000° 38.090 GC1EWC0
- CH 100 N 51 ° 42.872 W 000° 38.266 GC1EWCB
- CH 101 N 51 ° 42.925 W 000° 38.401 GC1EWCK
- CH 102 N 51 ° 43.005 W 000° 38.588 GC1EWCT
- CH 103 N 51 ° 43.022 W 000° 38.777 GC1EWD0
- CH 104 N 51 ° 43.163 W 000° 38.892 GC1EWD3
- CH 105 N 51 ° 43.069 W 000° 38.965 GC1EWDB
- CH 106 N 51 ° 43.111 W 000° 39.119 GC1EWDH
- CH 107 N 51 ° 43.140 W 000° 39.274 GC1EWDK
- CH 108 N 51 ° 43.205 W 000° 39.432 GC1EWDY
- CH 109 N 51 ° 43.370 W 000° 39.308 GC1EWE4

You will need a pencil! You'll also need some paper, to record the letter values so that you can go for the bonus.

But what else?

Originally, I didn't suggest anything. But following the experience of intrepid cachers, I'd recommend:

I know what you're thinking. You're thinking, if just one of these is muggled, I won't be able to do the bonus.

No, I thought of that. I've done this a bit differently. I also get rather frustrated when I do a long series, but can't do the bonus because I couldn't find one of the caches.

Muggling is sure to happen with at least one of these caches - there's so many of them! So, I've allowed for that.

If you find enough (enough depends on how many are available and have bonus letters) of these 109 caches, you can go for the bonus. And there's no complicated formula to work out! All you have to do, is put the numbers you've gathered, into this form and it'll tell you the coordinates of the bonus cache. And please don't try to guess and guess and guess - the form won't let you make more than 24 attempts per day.

Some people might need a wifi hotspot for this. You might try the Chesham Study Centre, but they're only open during certain hours, check their page for details. Elgiva Lane is at the centre of Chesham, a short walk from cache number 49.

And what a bonus it is! It's a big ammo box, containing (initially) goodies such as a webcam, a big hard drive ... So make sure you bring along worthy trades for this Golden Bonus.

One guy "Took hard drive, left a nice caching friendly pen on lanyard". That was a 300 gb hard drive traded for a biro. That's not what I would regard as a worthy trade.

Not everyone can do it in one day. A few people have asked "Where can I stay in the area?". Trouble is, I live here, so I've never used any local B&Bs.

If you do find anywhere to stay, even if it's barely adequate, please let me know.

esscafe says "The B and B was just ok. and 40 quid so not the cheapest I have had but to be honest I couldn't find much around. It is right on the route which is good but I would not recommend it especially; however if anyone asks you about anywhere to stay then you could give them the number 01494-771029 at 1A Stanley Avenue Chesham. One other cacher from up north booked while I was there, the lady was trying to tell him about things to do and he said he just wanted to walk in 3 circles!"

stagramblers says: "We stayed at a good self catering cottage and if people are interested it was off a letting agency www.letsunlimited.com which featured our cottage Bishopsfield, Wigginton. It even had Broadband!!! You said to let you know if we could recommend anywhere. Also the first time we came down we had a B & B (one room only) at Braziers Well, Braziers End, Nr Chesham, very good . Neither particularly cheap but its the area!"

De Vere Venues in Chesham has a special deal for £19, but there may be special terms and conditions applying - check their web site carefully. I don't know how good it is there.

Here's what the Levett's say:

We stayed their when we did the series and it was wonderful. The rooms were spacious and the facilities were excellent. The breakfast was 'all you can eat ' which is essential when facing a day of walking. There was free wi-fi as well. I think it is a conference centre during the week and so they offer discounted stays at the weekend. We stayed Friday to Sunday evening and noticed to new guests arriving on Monday morning armed with laptops suits etc. I would certainly recommend it to others.

Another handy place is the Chartridge Conference Center

Read about other people's achievments

And here's a summary of the cache finds

You don't want to check 110 pages just before you set off. So I'll list changes to the series here.