Eichkogel, Nature reserve summit in Mödling, Austria.

Eichkogel is a 367-metre hill south of Mödling in Lower Austria, protected since 1960 and enlarged in 1991. Its cone shape comes from two freshwater limestone plates formed in the late Tertiary that shielded the clayey sands beneath from erosion. The south side carries planted black pines and a downy oak steppe forest, the north side a tall herb fringe with elecampane and bloody cranesbill.

The mountain developed over thousands of years through soil deposits that created specific ground conditions. These special soils allowed rare plant and animal species to settle and establish themselves here.

The site attracts researchers who study how soil and rocks shape which plants and animals can live here. Visitors walking through notice how the landscape changes from open grassland to dense shrub zones.

The summit is accessible by foot from nearby areas, though hikers should expect uneven terrain and steeper sections along the way. The ascent takes several hours, so sturdy footwear and an early start help make the visit more comfortable.

Of the roughly forty to fifty pontic insect species at Eichkogel, more than ten percent of the world population lives here, packed into the small hill's varied niches. The sand-loess soil keeps drawing new arrivals, such as owl moths and the sand wasps that hunt them.