Legislative constituencies are used in Russia to elect half of the seats (225) in the State Duma. Each Federal Subject gets a certain amount of constituencies, proportional to their population, with every Federal Subject getting at least one. Every constituency is a single-mandate one, meaning each constituency sends one representative (also known as a Deputy) to the State Duma.
Constituencies are created and their boundaries drawn by the Central Election Commission. According to Federal Law, the layout of constituencies are to be used for 10 years. Using these current constituencies, elections were held to the State Duma in 2016 and 2021.