a large area of flat unforested grassland in southeastern Europe or Siberia.
A steppe is not a body of water. This is a land form which consists of a large flat grassland area which is not forested in Siberia of SE Europe.
savanna - a flat grassland.
Serengeti Plain
A large area of treeless grassland can be a plain, savanna or prairie.
Moutains, Flat plains, rivers, and swamps.
Grasslands are vast open areas dominated by grasses and have relatively few trees. They typically have flat or gently rolling terrain, with varying levels of precipitation and seasonal fluctuations in temperature. These ecosystems support a diverse range of plant and animal species adapted to this habitat.
Steppes are large areas of flat grassy land where there are no trees, especially the area that stretches from Eastern Europe across the south of the former Soviet Union to Siberia. The horse galloped across the steppe.
The most usual term for large, flat areas is plains.
A large flat area of land usually without many trees is called a plain or a prairie. Plains have grasslands and few trees, while prairies are large expanses of flat grassland.
plains
A prairie is a large area of flat or rolling, predominantly treeless grassland, much larger than a field .