The Tatra Mountains, Tatras or Tatra (Tatry in both Slovak and Polish), constitute a mountain range which forms a natural border between Slovakia and Poland. They occupy an area of 750km², the major part (600km²) of which lies in Slovakia. The highest Tatra peak, at 2655m, is Gerlachovský štít, located in Slovakia. Rysy, at 2499m, is the highest Polish peak.
The Tatra Mountains are the highest mountain range in the Carpathian Mountains. Although considerably smaller than the Alps, they are classified as having an alpine landscape. Their high mountain character, combined with great accessibility, makes them popular with tourist and scientists.
The Tatra Mountains (especially the High Tatras) are known to have undergone four glaciations. The most extensive transformations were caused by a glacier 100-230 m thick; the most apparent features of this process are the numerous cirques and mountain lakes. The mountains were shaped by glacial erosion, which formed many alpine cliffs, some up to 1,000 m high.