Why is Fujian’s coastline so irregular?

Fujian’s coastline is characterized as a submerged rocky coast, which contributes to its extreme irregularity. This complex shoreline, spanning approximately 1,680 miles (2,700 km), is defined by an abundance of islands, islets, capes, peninsulas, bays, and havens.1

The geological formation of the region is largely responsible for this landscape. The province is part of a raised massif that has undergone significant folding and refolding, with mountain ranges that broaden as they approach the coast. Furthermore, the presence of faults both along and across the axes of these mountains has caused extreme fragmentation of the land surface, resulting in a complicated relief pattern that extends to the sea.1