The sea dike running southwards from Ba Lat estuary (the Red River) through Ha Lan estuary (the Co River), and Lach Giang estuary (the Ninh Co River) ends at Day estuary (the Day River), marking the far end of the fertile coastal land of Nam Dinh province. The small, high and winding dike flows like a wave and offers those who travel on it a great site for the eyes.
Outside the dike, silver waves bring boats in and out. Inside, near the foot of the dike are salt fields. Salt farmers in northern coastal provinces produce salt for 6-7 months of the year. Therefore, if you want to see the making of the salt, the glistening beauty of the pure and white salt, go to Nam Dinh province and get to the above mentioned sea dike on summer days.