The most attractive landscape feature of Érd-Parkváros is the Fundoklia Valley, a dry karst ravine formed in the Sarmatian limestone. Not far from its head (just north of today’s M7 motorway), a Middle Palaeolithic settlement was discovered by chance at the end of 1962. The archaeology and palaeontology of this hunters’ settlement in two interconnecting basins were explored by Vera Csánk Gábor and Miklós Kretzoi respectively, and it has become well known in the outside world as an example of the Mousterian culture of Neanderthal Man. The excavations of the two layers of culture and five settlement levels revealed almost 50,000 remains of 37 species of animal, from which it emerges that the commonest prey of the inhabitants was cave bear, with considerable numbers of Ice-Age horse, hyena, woolly rhinoceros, various deer, cave lion, panther and mammoth. Also found and described have been 61 types of mainly flaked stone tool made of scree pebbles, quartzite and wood opal. These prehistoric men who lived in Érd 50,000 years ago, before the last Ice Age, have left more than 900 so-called Pontine stone tools used in leather work.
 
There is no permanent water course in Fundoklia Valley, although its steep sides are scoured by occasional downpours. This has exposed its geological structure in several places. The steep sides of Sarmatian limestone are bare, but the bottom of the valley has a continuous cover of shrubs and trees. Further insight into the geology of the plateau comes from the numerous natural caves and cavities and man-made alcoves.
 
Bee-eaters nest in the high clay and loess embankment to the north of the valley. There are 25 protected species of plant in and around Fundoklia Valley, perhaps the most attractive being yellow pheasant’s-eye (Adonis vernalis), found on the dry, stony grass slopes in May, and classed as a medicinal plant due to the regulating and tranquillizing effect on the heart of the adonidines in its rhizomes. Also typical of the feather-grass grassland of the plateau is the deciduous periwinkle Vinca herbacea, which yields the effective ingredient vincamin for drugs to control blood pressure. The hot grassland over limestone is the home of Allium moschatum, whose musk-scented flowers appear in August and September, while the cooler shade of the hornbeam scrubland is the place to find martagon lily (Lilium martagon).
 
The fauna of the valley include several protected species of lizard and shrew, and the Aesculapean snake is also present. Sadly, the valley has been harmed in many places by human intervention, including illegal dumping of waste.