Tempozan is a “mountain” located on the shore of Osaka Bay in Minato-ku, Osaka City. I say “mountain” because, while it is officially recognized as so, its summit is at a whopping 4.53 meters. Needless to say, this is Japan’s smallest mountain. Artificially formed in 1831, Tenpozan once had an elevation of about 20 meters and was primarily used as a landmark for ships coming into a the busy trading port. It is currently located within Tenpozan Park, which actually features hills higher than the “summit” itself.
If you climb this beast of a mountain, the Mt. Tenpo Expedition Society will issue you a certificate (for a small fee) indicating that you have done so.
Tempozan can be accessed from Osakako Station on the Chuo Subway Line (about 15 minutes on foot).