The town of Amposta, a seaport in the 4th century, demonstrates the historical rate of growth of the delta as it is now located well inland from the current river mouth.
The rounded form of the delta attests to the balance between sediment deposition by the Ebro and removal of this material by wave erosion.
The Rice-producing Cooperative of the Ebro Delta accounts for a production capacity of 45 thousand tonnes of rice annually, from 14 varietals,[7] cultivated on 22,000 hectares.
[8] Compared to the major Spanish rice-producing regions of Andalusia and Extremadura, yields in the Ebro Delta are more consistent, due to a stable water supply.
"[8] A network of canals and irrigation ditches constructed by both agricultural and conservation groups are helping to maintain the ecologic and economic resources of the Ebro Delta.