请问这几个句子到底是宾语从句还是地点状语从句？！！具体解析一下为什么？

Question

After graduation we should go where our Party needs us most.
Water power stations are built where there are big water falls

Answer 1

where our Party needs us most
where there are big water falls
------这两个都是地点状语从句部分。
如果是定语从句，句子是
1 After graduation we should go to the place where our Party needs us most.
2 Water power stations are built in the places where (in which ) there are big water falls