The Akaishi-dake at 3'120 m is a summit of the Akaishi Mountains (Southern Alps) in the Japanese Alps within the Minami Alps Nationalpark. It is situated at the border of the Nagano and Gifu Prefectures.
The Akaishi-dake is one of the 100 famous Japanese mountains.
Japan 1967, Akaishi Range.
The stamp is probably showing a view from the Warusawa-dake, also known as Higashi-dake towards Akaishi-dake, Hijiri-dake and the Kamikouchi-dake in the far background left.
Japan 2011, Akaishi-dake.
The stamp was issued in the sheet "Japanese Mountains Series No 1".