The Adršpach Rocks (Adršpašské skály) with its unspoiled beauty and grandeur has become a sought-after wonder of nature. Along with the neighbouring Teplice Rocks Area, it forms the most distinguished sandstone plateau in the Police Basin in the Broumov Highlands. Todays, both the "rock towns" with the area of 4,456 acres rank among most frequently visited national parks in the Czech Republic. It was declared national monument as early as 1933. A separate Cross Hill Area was declared in 1956. Since 1991, these areas have been part of the Broumovsko Protected Landscape.
In the Palaeozoic era, this area was a tectonic basin or depression formed by orogenic movements in the Earth's crust about 350 million years ago. There were numerous lakes and swamps on the floor of the depression with luxuriant vegetation. The prehistoric rivers flowing down the neighbouring mountain ranges deposited layers of mud and sand on the floor burying the plants under them. In this way, the nearby deposits of black coal were formed. In the second half of the Mesozoic era, approx. 100 million years ago, a shallow seaway spread into the interior of what we now call Central Europe. On the bottom of this sea, mighty layers of sand were deposited. Their weight and various chemical processes connected individual grains together forming sandstone rock. As the seaway transgressed (advanced inland) over the region and retreated several times, different layers of different materials were deposited again and again over the older ones. This resulted in various composition and resistance of indivi dual layers.
After this area was uplifted in the Tertiary period, the sea retreated for good. The weight of the mighty layers of the hoisted and exposed sandstones broke the seafloor layers into a great number of individual blocks that eroded with time. Only the most resistant parts of what was once the seafloor, the square-shaped sandstone blocks, have persisted. Nowadays they can be seen in this region in the form of various table mountains, buttes, uplifted plateaus and rock areas. Geologic faults and cracks in this area are perpendicular to each other stretching in the NW - SE and NE - SW directions.
The Adršpach Rocks (Adršpašské skály)
The rockiest section of this plateau is located to the north of the Wolf's Gorge (Vlčí rokle) and includes also it short section above the Lake. The elevation differences are relatively high here ranging from 500 metres to 660 metres above sea level measuring from the lowest to the highest parts of the plateau. The highest point in this area is the Old Castle Hill (Starozámecký vrch) with its elevation of 671 metres above sea. The highest rock formation is the Lovers (Milenci) measuring around 96 metres from its bottom to its top. The rock area is flown through by the Watercress and Rock Creeks with numerous tributaries and by the Metuje River that rises nearby. Besides, visitors to this national Park can find two waterfalls an artificial lake and a large lake in the place of the former sandpit.
Cross Hill (Křížový vrch) (Elevation: 667 metres)
Cross Hill towers just across the Adršpach Rocks. It is an isolated and intensively eroded butte or block of once unbroken plateau. The only parts of the plateau that have persisted up till today are two arch-shaped rocky ridges with steep slopes on both sides and the south promontory separated from the rest of the Hill by narrow gorges.