The whole system commands 15.5 million hectares in which soil quality varies from moderately fine and deep alluvial deposits in the flood plains to coarser deposits on the higher ground (bar) between the rivers.
(The whole system; commands; 15.5 million hectares in which soil quality varies from moderately fine and deep alluvial deposits in the flood plains to coarser deposits on the higher ground (bar) between the rivers) (15.5 million hectares; varies; from moderately fine and deep alluvial deposits in the flood plains to coarser deposits on the higher ground)
The whole system 15.5 million hectares
commands varies
15.5 million hectares in which soil quality varies from moderately fine and deep alluvial deposits in the flood plains to coarser deposits on the higher ground (bar) between the rivers
from moderately fine and deep alluvial deposits in the flood plains to coarser deposits on the higher ground