Why the parish map is still the best starting point

In West Wales, the landscape keeps its paperwork close. Tithe maps from the 1840s, enclosure awards, estate plans and the old six-inch and twenty-five-inch map series show field patterns, boundaries and paths that have since been simplified or lost. Begin by choosing a single parish—say somewhere along the Teifi, in the Preseli foothills or on the south Pembrokeshire coast—and gather every map extract you can at a consistent scale. Note the grid references of churches, wells, crossroads, mills and standing stones. Read the names carefully: Ffynnon means a spring or well, Llan often marks an early church enclosure, Nant a stream, Cwm a valley, and Mynydd open upland. These names are not decoration; they are clues to water and old ways.

Boundaries, footpaths and old ways

Historic boundaries are rarely random. In West Wales they often follow a stream, a ridge, an old hedge bank or a dry stone wall, but now and then they run unnaturally straight for a few hundred metres. That is worth marking. Compare the tithe map boundary with the modern public right of way. Does the footpath still run beside the same hedge? Has a lane been diverted around a farmyard? Look for "double boundaries"—a parish line and a path running together—and for places where three parishes meet. Crossroads, fords and bridges are also strong candidates.

• Mark every point where a boundary changes direction sharply.
• Note old gates, stiles and stone steps that suggest a well-used route.
• Check for drovers' roads and church paths, which often cut across country rather than following contours.
• Use a ruler on the map to test whether three or more features fall on a straight line; record the grid references, not just a rough line.

Churches, wells and yew trees

Church placements in West Wales often sit on earlier sacred ground: a spring, a river confluence, a ridge with a wide view, or a circular enclosure. Many are dedicated to saints such as David, Non or Teilo. The building itself may be later than the site. On the map, draw a line through the church door, the lychgate and the nearest well or Ffynnon. Add the yew tree if it is marked. Then look for a standing stone, a motte, or an old mill on the same bearing. One or two points prove nothing, but a sequence of four or five begins to look like a pattern worth checking on foot.

Water divining and the ground beneath

Water divining works best when it is grounded in geology. In West Wales, springs cluster where permeable rock meets clay, along fault lines, and near dolerite dykes that cut across the older sedimentary beds. Glacial sand and gravel can hold water, while slate and mudstone shed it. Before you take rods into the field, mark likely spring lines on the map: the break of slope, the junction of two rock types, the head of a valley, and the line of an old field drain. Use L-rods or a pendulum lightly. Ask a specific question—"Show me water flowing in a pipe" or "Show me a natural spring"—and note the response. A rod that crosses sharply is not proof; it is a prompt to look for wet ground, rushy patches, watercress or a stone-lined culvert.

Earth energies and possible alignments

Earth energies are the most speculative part of the work, so treat them as a working hypothesis. Some dowsers report subtle lines, sometimes called leys, that link churches, wells, tumuli and crossroads. On the map, an alignment is simply a straight line through several features. On the ground, it may show up as a change in how the rods respond, a sudden chill, or a difference in vegetation. Do not force it. Old tracks, boundaries and field edges can create straight lines for practical reasons, and a modern fence can mimic an ancient one. Keep a control: pick a random line nearby and walk it with the same attention. If the dowsing response is only on your chosen alignment, that is interesting; if it appears everywhere, you are probably reading your own expectations.

Planning the field visit

Once you have a shortlist of alignments, plan a field visit rather than trying to cover the whole parish. Check access first: public rights of way, common land, and permissions for private ground. Take a map, compass, GPS or phone, notebook, pencil, camera, waterproofs and sturdy boots. West Wales weather changes quickly, and wet ground can make springs obvious but paths treacherous. Walk each alignment in both directions, record grid references at every response, and note the time, weather and ground conditions. Keep gates closed, stay clear of livestock, and never dig or disturb a scheduled monument. A good field visit ends with more questions than answers—and a map marked with lines you can test again another day.