 What if we were to tell you that 4,000 years ago, carvings were taking place in stone to forever remember a location that has since been forgotten about, described by researchers as the oldest 3D map still in existence in Europe, forgotten about were the ones who treasured it and mysteriously vanishing in 1900 shortly after it was discovered, taken away from prying eyes to seek out the location that it highlights and researchers in France studying the slab believe they have identified the area that it maps out. The piece of rock, known as the St Bilex slab, is believed to date from the early Bronze Age around 2000 BC making it almost 4,000 years old. It was first unearthed in 1900 during the digs in a prehistoric burial ground on Western Brittany by local archaeologist Paul de Châtelier, apparently forgotten about for over a century, stored for decades under a moat at Châtelier's home and rediscovered in the cellar there in 2014. The researchers say the indentations are a 3D representation of the river Odette Valley while several lines appear to depict the area's river network. Geolocation data revealed the territory represented on the slab bears an 80% accuracy to an area around 18 miles along the stretch of river. Dr Clement Nicholas from Bournemouth University and researcher for the project said that this is probably the oldest map of a territory that has been identified. There are several similar maps carved in stone all over the world. Generally, they are just interpretations, but this is the first time a map has depicted an area on a specific scale. We tend to underestimate the geographical knowledge of past societies. This slab is important as it highlights this cartographical knowledge, it highlights a concrete effort to remember a specific area, it highlights prehistoric importance to remember key aspects of terrain, an effort to never forget.