Mangystau Province (Kazakh: , Mañstaw obls) is a province of Kazakhstan. Its capital is Aktau (a seaport), which has a population of 154,500 (2004 census); the entire Mangystau province has a population of 373,400. The province is located in the southwest of the country, and includes Mangyshlak Peninsula. It has much of Kazakhstan's Caspian Shore. It also borders neighboring countries Turkmenistan and Uzbekistan. Mangystau also borders two other Kazakh provinces(counter-clockwise), Aktobe Province and Atyrau Province. The area of the province is 165,600 square kilometers. Engineers discovered petroleum in the area in the days of the Soviet Union, drilling commenced, and much of the area was built up around the industry. The territory of Mangystau includes lots of different landscapes and desert lands: Caspian lowland, plateaus (Usturt, Mangyshlak, Kendirli-Kayasan), mountains (Aktau, Karatau), cavities, desert, mountains and mountain ridges. That kind of landscape forms an original multigraded labyrinth, painted with green, yellow, pink and red sediment of loam. The highest point is Otpan mountain at 556 metres (1,824 ft). The lowest point is the bottom of Karagie cavity, 132 metres (433 ft) below sea level.