Welcome to planet X! Planet X is the same as Earth in radius, composition, axial tilt and orbits star Y (identical to the Sun). Planet X has a moon known as moon Z (identical to Earth's moon).
Could an east Mongolia-like region (Köppen BSk) exist on planet X meeting all of the following requirements?
- At least 4 million sq. km. of contiguous Köppen BSk/BWk climate type (preferably 5 million sq. km.)
- Relatively compact (not a long, narrow strip of BSk/BWk climate type)
- Occasional plateaus with colder weather (Köppen Dwb/Dwc) on top
You may do anything with planet X as long as it meets this requirement.