What does it mean that the two rivers meet in golden road and the two cities jointly cast a cornucopia?

The two rivers meet at the Golden Road, and the two cities jointly cast a cornucopia, which refers to the Grand Canal and Huitong River. Twin cities refer to Linqing Old Town, which is known as Tucheng and Brick City. The two rivers meet in the twin cities, which means that people in the twin cities live a rich life. These two sentences are couplets on both sides of the gate of Linqing Banknote Pass. Linqing Canal banknote port is located near Huitong River in the old city of Linqing in Ming Dynasty. It was directly affiliated to the central government in the Ming and Qing dynasties to supervise the canal water transport tax, and it was also the only existing canal bank note. Now it is a national key cultural relics protection unit. Linqing Canal Banknote Pass was established in the fourth year of Xuande in Ming Dynasty (1429) and the tenth year of Xuande (1435). Linqing Banknote Pass has been upgraded to the tax collection office of the Ministry of Household Affairs, which directly controls and supervises tariffs, with five sub-offices. During the Wanli period, more than 83,000 taels of tax was collected, more than Chongwenmen Customs in Beijing, ranking first among the eight customs in China, accounting for a quarter of the national tax revenue. In the twenty-seventh year of Guangxu in Qing Dynasty (190 1), the canal transportation stopped and the treasurer was abolished.