Lake Balkhash - Relief

Relief

The lake has an area of about 16,400 km2 (2000), making it the largest lake which lies entirely within the territory of Kazakhstan. It is elevated about 340 m above sea level and has a crescent shape. Its length is about 600 km and the width varies from 9–19 km in the eastern part to 74 km in the western part. Saryesik Peninsula, located near the middle of the lake, hydrographically divides it into two very different parts. The western part, which comprises 58% of the total lake area and 46% of its volume, is relatively shallow, quiet and is filled with freshwater, whereas the eastern part is much deeper and saltier. These parts are connected by the Strait Uzynaral (Kazakh: Ұзынарал – "long island") which is 3.5 km wide and about 6 m deep.

View of Lake Balkhash from Space (August 2002)
The numbers mark the largest peninsulas, island and bays:
  1. Saryesik peninsula, separating the lake into two parts, and the Strait Uzynaral
  2. Baygabyl Peninsula
  3. Balai Peninsula
  4. Shaukar Peninsula
  5. Kentubek Peninsula
  6. Islands Basaran and Ortaaral
  7. Tasaral Island
  8. Shempek Bay
  9. Saryshagan Bay

The lake includes several small basins. In the western part, there are two depressions 7–11 meters deep. One of them extends from the western coast (near Tasaral Island) to Cape Korzhyntubek, whereas the second lies south from the Gulf Bertys, which is the deepest part of western Balkhash. The average depth of the eastern basin is 16 m and the maximum depth of the eastern part (and of the lake) is 26 m. The average depth of the lake is 5.8 m, and the total volume of water is about 112 km3.

The western and northern shores of the lake are high (20–30 m) and rocky; they are composed of such Paleozoic rocks as porphyry, tuff, granite, schist and limestone and keep traces of ancient terraces. The southern shores near the Gulf Karashagan and Ili River are low (1–2 m) and sandy. They are often flooded and therefore contain numerous water pools. Occasional hills are present with the height of 5–10 m. The coastline is very curvy and dissected by numerous bays and coves. The large bays of the western part are: Saryshagan, Kashkanteniz, Karakamys, Shempek (the southern pole of the lake), and Balakashkan Ahmetsu, and those in the eastern part are: Guzkol, Balyktykol, Kukuna, Karashigan. The eastern part also includes peninsulas Baygabyl, Balay, Shaukar, Kentubek and Korzhintobe.

The lake contains 43 islands with the total area of 66 km2; however, new islands are being formed due to the lowering of water level, and the area of the existing ones is increasing. The island of the western part include Basaran and Tasaral (the largest), as well as Ortaaral, Ayakaral and Olzhabekaral. The eastern islands include Ozynaral, Ultarakty, Korzhyn and Algazy.

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