Geography of Kazakhstan the water in Kazakhstan is polluted by industrial effluents, pesticide and fertilizer residue, and, in some places, radioactive elements. The most visible damage has been to the Aral Sea, which as recently as the 1970s was larger than any of the Great Lakes of North America save Lake Superior. The sea began to shrink rapidly when sharply increased irrigation and other demands on the only significant tributaries, the Syr Darya and the Amu Darya (the latter reaching the Aral from neighboring Uzbekistan), all but eliminated inflow. During the Soviet Era, Kazakhstan received water from Tajikistan and Kyrgyzstan, and Uzbekistan, Turkmenistan,
Kazakhstan–Uzbekistan border awarding the city to Uzbekistan. Kazakhstan however gained the large city of Shymkent. A further complication were the Karakalpaks; the Soviets were unsure if they were Uzbeks, Kazakhs or a separate nationality altogether. Given the at-best weak sense of Karakalpak nationality, and their perceived closer links to the Kazakhs, they were given their own Karakalpak Autonomous Oblast within the Kazakh ASSR. This oblast was larger than the modern autonomous Republic of Karakalpakstan and extended considerably further eastwards, thereby cutting the Uzbek SSR in two, with a small exclave around Khiva. Poor economic performance in the oblast convinced Soviet leaders that