Please answer the following question: The Immenberg (also spelled Imebarg) is a mountain located between Thundorf and Stettfurt in the canton of Thurgau.The summit forms a wooded plateau which is traversed by several trails. On the south-west slopes of the mountain is located the Sonnenberg Castle. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Natural Place