the module in maven

[maven apache]

Hi:
I want to know how do maven find the module of the parent project:
for example in the root project whose packaging is pom and the directory is
C:/project, I define the following modules:
-----
  <module>maven</module>
  <module>platform</module>
  <module>main</module>
--------------
So the module "maven" should be a directory under the C:/project/maven or
the directory contains module "maven" can be named as others and its
artifactId should be "maven"?