The Mari El Republic (Russian: Респу́блика Мари́й Эл, Respublika Mariy El; Meadow Mari: Марий Эл Республик; Hill Mari: Мары Эл Республик) is a federal subject of Russia (a republic). Its capital is the city of Yoshkar-Ola. As of the 2010 Census, the population of the Mari El Republic was 696,459.

The republic is located in the eastern part of the East European Plain of Russia, along and mostly to the north the Volga River. The swampy Mari Depression is in the west of the republic, contrasted by more hilly landscapes in the east where the highest point of the republic (at 278 meters (912 ft)) is located. The republic borders with Kirov Oblast in the north and east, the Republic of Tatarstan in the southeast and south, the Chuvash Republic in the south, and with Nizhny Novgorod Oblast in the west and north. There are 476 rivers in the republic, with the Volga and its tributaries being the major water arteries. Most rivers are considered to be minor—10–50 meters (33–164 ft) wide and 0.5–1.4 meters (1 ft 8 in–4 ft 7 in) deep—and usually freeze between mid-November and mid-April. There are over 700 lakes and ponds; many located in the swampy areas and having areas of less than 1 square kilometer (0.39 sq mi) and depths between 1 and 3 meters (3 ft 3 in and 9 ft 10 in). Lake Yalchik, occupying 150 hectares (370 acres), is the largest by area, while Lake Tabashinskoye is the deepest. Swamps cover large areas—10–70 square kilometers (3.9–27.0 sq mi) and up to 100 square kilometers (39 sq mi)—and usually freeze in December. While swamps tend to be shallow, with an average depth of 0.5–1.5 meters (1 ft 8 in–4 ft 11 in), they are impassable in fall and spring due to flooding.

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