The alvar on Maarjamäe cliff is where very valuable plant communities, including several rare plant species, grow. In addition to the valuable habitats such as the alvar and cliff, there is also a forest under the cliff. The cliff forest is relatively young – the oldest trees are about 100 years old.
Maarjamäe limestone shore is the highest and most observable part of the Northern Estonian Klint in Tallinn. The most outstanding part of the limestone shore is the Sugar Hill (Suhkrumäe) outcrop. Vivid outcrops of Cambrian and Ordovician rocks can be seen in the high bench. The relative height of the bench is a maximum of 30 m; its absolute height is 47 m.