These flow features are extensive systems—sometimes hundreds of kilometers in total length—of interconnecting, twisting channels that seem to merge into larger, wider channels.

拥有庞大的系统是径流渠道的流动特征——有时总长达数百公里——这些系统由蜿蜒交错的渠道组成，而且这些渠道可能会并入更长更宽的渠道。