Maapähkel

Maapähkel, also known as Glenoid fossa, is a geological feature located on the island of Saaremaa, Estonia. It is a large pit or crater, approximately 70 meters in diameter and 10 meters deep, that has been formed as a result of the collapse of a caldera.

The exact mechanism of the Maapähkel's formation is still a topic of research and debate among geologists. However, it is believed to have been caused by the collapse of a layer of clay which covered the top of the caldera. This collapse led to the formation of the pit which is now visible.

Maapähkel has been designated a protected site by the Estonian government, in part due to its unique geological features. The site is also home to a variety of plant and animal species that are adapted to the region's unique conditions.

Visitors to Maapähkel can hike to the rim of the pit, which offers views over the surrounding countryside. This area also provides opportunities for birdwatching and the observation of local flora. There are, however, restrictions on access to the site, including a prohibition on climbing on the crater's walls.

The Maapähkel site has also been the subject of scientific study, with researchers collecting data on the geology and ecology of the area. This data is used to inform our understanding of the site's unique features and to make recommendations for its management.