They run north-south parallel to the north-flowing Yellow River in the Ordos Loop section.
The river is mostly east of the mountains, but in the north it crosses without making a significant gorge and flows on the west side.
Together they now own 20,000 acres (8,100 ha) of land for planting vineyards and Dynasty has ploughed 100 million yuan into Ningxia.
In addition, the major oil company China Petroleum and Chemical Corporation has founded a vineyard near the Helan Mountains.
The household appliance company Midea has also begun participating in Ningxia's wine industry.