The Kalkkikallio nature conservation area is in Kuninkaala city district, bordering Helsinki, on the southern side of Ring Road III. The rugged, rocky hilltops in the area rise to a height of nearly 65 metres above sea level. The top has a great view of the surrounding city. The new nature path built in the area leads visitors past the rugged rocky cliff walls, large boulders and the cave-like holes between them up to the scenic spot on top.
The area's name, Kalkkikallio, means 'limestone rock'…and - true to its name - limestone can be seen in the area and its presence in the region's vegetation and plants. For example, basil thyme, which is otherwise rare in Vantaa, grows on these rocky hills. Picky grove plants thrive at the bottom of the hills surrounding the rock, such as baneberry, wonder violet, Kashubian buttercup and dog's mercury.
Younger deciduous forest grows in a few spots around the rocks, but the pine trees on the rocks have thick barks that reveal some of them to be more than a hundred years old. The eastern part of the conservation area has a wet forest swamp depression, and a small brook starting from it has carved a deep groove on the side of the steep hill.
Kalkkikallio is in the middle of built environment and it is a habitat to a diverse population of birds. The largest Finnish species of thrush, mistle thrush, is one of the species nesting in the area. Other bird species spotted in the area include the lesser spotted woodpecker, black woodpecker, Eurasian sparrowhawk and tawny owl.
The Kalkkikallio nature conservation area was protected in 2007. The conservation area's size is 18.7 hectares. There is a signpost at the beginning of the Kalkkikallio nature trail on the southern edge of the protected area.