Azas Nature Reserve (Russian: Азас заповедник) is a Russian 'Zapovednik' (strict nature reserve), located in the central part of the Todzha basin (a large intermountain trough within the Altai-Sayan mountain region) of south-central Asia about 500 km west of Lake Baikal. The reserve stretches along the Azas River, and is situated in the Todzhinsky District of Tuva. The reserve covers a dense network of rivers and lakes in the mountain headwaters of what eventually becomes the Yenisei River. The primary river is the Azas River, which flows into Todzha Lake (Todzha is another name for Azas), before flowing out again as the Toora-Khem River. The base rock is Proterozoic and Paleozoic (that is, older than 250 million years) sandstones, limestones and various intrusions. In most of the territory this is covered with recent (Quaternary) moraine and fluvial sediments. More information...
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