The highest peak is called Gerlachovský štít, which is 2,655 metres tall. That is much shorter than the Alps in nearby Switzerland, but the High Tatras look just as dramatic - sharp grey peaks rising straight up out of dark green forests, often with snow on top even in summer.
Hidden among the peaks are around 100 small mountain lakes called 'plesá'. They are leftovers from the Ice Age, when huge glaciers carved out hollows in the rock. Today the plesá are clear, cold and bright blue, surrounded by stone. The most famous, Štrbské Pleso, sits next to a village of the same name.
Slovakia and Poland share the Tatras - the border runs right along the top of the ridge. Hikers can stand on a peak with one foot in each country. Both countries have made the Tatras into national parks, so the forests, the bears and the wildflowers are all protected.
In winter the Tatras turn into a giant playground for skiing and sledding. In summer they fill up with hikers, climbers and families looking for cool mountain air. There is even a special little electric train that runs along the foothills, taking visitors from one mountain village to the next.