East Kazakhstan Region (, Sigis Qazaqstan oblisi) is a region of Kazakhstan. It occupies the easternmost part of Kazakhstan, along both sides of the Irtysh River and Lake Zaysan. Its administrative center is Oskemen (also known as Ust-Kamenogorsk). The region borders Russia in the north and northeast and the People's Republic of China (Xinjiang Uighur Autonomous Region) in the south and southeast. The easternmost point of the Oblast is also very near, within 50 kilometers or so of the westernmost tip of Mongolia; however, Kazakhstan and Mongolia do not share a common border, the two countries being separated by a small part of Russia and China.It also borders the Kazakh Regions of Pavlodar Region (to the north west), Karaganda Region (to the west), and Almaty Region (to the south).