The first system is Google-illustrated at Go Cong 1 and 2
(Figures 4A and B; Vinh Trach Dong and Ganh Hao), where the
primary sea dike is located right in front of the squeezed
mangrove forest. In the second system, human interventions
are found between the sea dikes and the mangrove forest. Kinh
Ba is an example of the second system where about 300-m
width in between the sea dike and the mangrove forest is used
for aquaculture (Figure 4C). To have land protected for
cultivation, a smaller and discontinuous sea dike is constructed
between the aquaculture area and the mangrove forest.