我觉得应改成 Much of the state’s land was formed …
这句话在参考文章里对应的是：Much of the land in this area was created from sediment that washed down from the Mississippi River. This is also what caused there to be so many marshes and swamps.
land 可数只有两种情形：指某人（组织）拥有的土地（资产），State Lands；指某个国家，Immigrants came from many lands.
本例说的是地理意义的土地，不可数。如果仅把 Much 改成 Many，语法
，语义
。
可以的，许多地带（much 强调整体性内在关联 ；land 土地,地带 [uncountable], 但 also “lands”；应该是意指地带之间有一定差异性，但仍要从一个整体角度看)。类似：一国两制，严肃活泼