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Вулкан Тятя-сан.jpg
Tyatya volcano in 1990
Elevation 1,819 m (5,968 ft)[1]
Prominence 1,819 m (5,968 ft)[2]
Listing Ultra
Tyatya is located in Sakhalin Oblast
Kunashir, Kuril Islands, Russia
Coordinates 44°21′3″N 146°15′23″E / 44.35083°N 146.25639°E / 44.35083; 146.25639Coordinates: 44°21′3″N 146°15′23″E / 44.35083°N 146.25639°E / 44.35083; 146.25639[1]
Type Stratovolcano / somma volcano
Last eruption June 1981[1]

Tyatya (Russian: Тятя, also spelled Tiatia and known as Chachadake (爺爺岳) in Japanese) is a volcano located in the northeastern part of Kunashir Island, Kuril Islands, Russia. It is the highest peak on the island with an elevation of 1,819 metres (5,968 ft).[1] Tyatya is one of the finest examples anywhere in the world of a somma volcano, a stratovolcano whose summit has collapsed to form a caldera which has then been mostly refilled by a new, younger volcanic cone which rises above the caldera rim.[1]

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