A small coal-burning stove heats the neighboring ger of Oyunsetseg's sister and her family on a snowy September weekend morning. Ulaanbaatar, Mongolia. Material World Project. The Regzen Batsuuri family lives in a 200 square foot ger (round tent built from canvas, strong poles, and wool felt) on a hillside lot overlooking one of the sprawling valleys that make up Ulaanbaatar, Mongolia.