Environmental issues in Kazakhstan at the Semipalatinsk nuclear testing facility (in fact a large zone south of Kourchatov (Курчатов)) and along the Chinese border. The Central Asian Regional Environmental Center is located in Kazakhstan, which fosters regional cooperation on environmental issues. Most of Kazakhstan’s water supply has been polluted by industrial and agricultural runoff and, in some places, radioactivity. The Aral Sea, which is shared with Uzbekistan, has shrunk to three separate bodies of water because of water drawdowns in its tributary rivers. A Soviet-era biological weapons site is a threat because it is located on a former island in the Aral Sea that
Kazakhstan–Uzbekistan relations border. On 19 October 2006, Kazakhstan built 45 km-long barrier along part of its border with Uzbekistan. The Kazakhstan–Uzbekistan barrier spans the Saryagash and Maktaaral administrative districts of southern Kazakhstan, and consists of a 2,5m-high barbed wire fence that includes searchlights. The barrier is situated along the heavily populated towns and cities of eastern Uzbekistan. It was built to curb drug smuggling across the border. Kazakhstan–Uzbekistan relations Kazakhstan–Uzbekistan relations refers to the relations between the neighbouring Republic of Kazakhstan and Republic of Uzbekistan. The last President of Uzbekistan Islam Karimov has visited Kazakhstan several times. Both Kazakhstan and Uzbekistan were