I get one queation in the damb
 

I get one queation in the dambreak tutorial of interFoam.
The setFieldsDict are shown below:
regions
(
boxToCell
{
box (0 0 -1) (0.1461 0.292 1);

fieldValues
(
volScalarFieldValue gamma 1
);
}
);


What does "box (0 0 -1) (0.1461 0.292 1)" mean?

In this case ,I don't see anything related to (0 0 -1) and (0.1461 0.292 1).
Could anyone help me,thanks?