Hells Canyon (Aratso Canyon) is located in the south-eastern part of Ararat province, near the border of Nakhijevan. Aratso River starts from the slopes of Gndasar Mountains, running through the south-eastern part of Urts Mountain Range it flows to Araks River. The length of the river is 25 km, the depth of the canyon is 100-400 m, the width is 1,5-80m. The slopes are bare, rocky and steep. There are many karst caves and cavities.
As a mountain river Aratso (Aratsoget) mostly is fed by melted snow and rainfall, it overflows in April-May. In upper streams, near Hortun village Zangakatun reservoir is located.
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