Where is the complaint about the illegal construction of Tashan Street in Dachangshan Island Town, Changhai County?

This should be determined according to the actual illegal situation and the nature of the land occupied. I can only give you a general suggestion. If it is rural collective land, I suggest you report it to the town government. If it is state-owned land, you can report it to the county land and resources bureau or the urban construction planning bureau. If infringement is involved, you can not only complain, but also bring a lawsuit through the people's court.