Engstlensee is a natural lake used as a reservoir in the municipality of Innertkirchen Bernese Oberland Switzerland. It is located near Joch Pass at an elevation of 1850 m. It can be reached by gondola and by foot from Titlis. The reservoir has a volume of 10.7 million m³ whereof 2 million m³ are used for electricity production. The lake's surface area is 0.44 km². 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?
Natural Place