The Jasmund National Park is a nature reserve on the Jasmund peninsula, in the northeast of Rügen island in Mecklenburg-Vorpommern, Germany. It is famous for containing the largest chalk cliffs in Germany, the highest of which is Königsstuhl, rising to 118 m (387 ft) above the Baltic Sea. The highest point in the park as a whole is Pieckberg, at 161 m (528 ft) above sea level. The beech forests behind the cliffs are also part of the national park.

Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton that had settled to the sea floor. Chalk is common throughout Western Europe, where deposits underlie parts of France, and steep cliffs are often seen where they meet the sea in places such as the Dover cliffs on the Kent coast of the English Channel.