Once his Biome Bomb was at Gold Grade, Inala could create any terrain that he had complete knowledge about. This knowledge basically stemmed from any race living in the region as natives.
Climate, soil composition, interaction of the flora with the environment, etc. All this information would be present in the data of a creature native to the region. Once Inala was equipped with that data, he could condense Prana to form the same terrain.
But this was limited to inorganic matter. As for organic matter, which he could only create at the Mystic Grade, he was limited to only those at the Dieng Canyon.
As for the terrain that he could condense within his Biome Bomb at the Gold Grade and above, Inala had four special versions: Sumatra Gold, Sandy-Grey Void, Attributed Region, and Bolt of Transcendence.