Tempozan is an Edo-period dredging mound at the mouth of the Aji River, in Tempozan Park, and a named mountain on the national survey map at 4.53 m. It was long called Japan's lowest mountain; since the survey authority's 2014 review it is the second lowest.
Why it's unique
This is the closest call in the Osaka list: the climb takes about a minute. It stays because it is a physical act with a checkable claim attached, a named mountain on the national survey at 4.53 m, rather than something you look at. If it is argued down, it belongs with art and monuments.
The local twist is the certificate: shops in the Tempozan shopping association hand out summit certificates, and there is a tongue-in-cheek "mountain rescue team".
Before you go
Residents report collecting the certificate from a takoyaki stall and a café in the shopping street rather than any official office.
Combine it with the Tempozan ferry to Sakurajima for USJ, which is how locals would do it. Osaka has a running "five low mountains" set, and Chausuyama in Tennōji Park issues its own certificate too.
