Short answers, pulled from the story.
The Maniototo Plain of New Zealand stretches beneath the Kakanui Range as a flat expanse with few rapid or steep changes in elevation. This landform covers more than one-third of the world's total land area and appears on all continents from coastal margins to high plateaus.
Skeiðarársandur in southeastern Iceland demonstrates how glacial outwash creates sandar, which are layered gravel and sand deposited by melt-water at a glacier's terminus. Depositional plains form when rivers deposit sediment over long periods to create alluvial soil that differs from flood plains experiencing regular flooding today.
The West Siberian Plain in Russia hosts tundra vegetation where polar conditions dictate plant life and animal migration patterns. Savannah biomes stretch across tropical regions like the Llanos in Colombia and Venezuela while temperate grasslands cover areas such as the Great Plains in Canada and the United States.
Fertile soils deposited as sediments along riverbeds allow mechanized crop production to flourish across vast stretches of the Pampas in Argentina and Uruguay. The flatness of these lands facilitates the use of heavy machinery for planting and harvesting crops efficiently while deep alluvial soils support high-yield agriculture due to nutrient richness.
The Po Valley in Italy serves as a prime example of a depositional plain formed by sediment accumulation over millennia. The Nullarbor Plain in Southern Australia stands as one of the largest limestone formations on Earth stretching thousands of kilometers while the Indo-Gangetic Plains span Bangladesh India Nepal and Pakistan.