Tenpōzan 天保山
Four metres fifty-three, and at the top there is a real triangulation point.
It is not a natural hill: it is the mound of earth dug out of the Aji River when it was dredged in 1831, piled up at the mouth to serve as a landmark for sailors. ⚠️ It lost the title of Japan's lowest mountain in 2014: after the 2011 earthquake Sendai's Hiyoriyama sank to 3 metres and the geographical institute recognised it as such. Tenpōzan remains the lowest of those built by people and of those with a second-order benchmark.
Osaka
Ōsakakō
