  5D supergravity generically has non-geometric moduli other than the radion
that belong to 5D vector multiplets. We summarize the impacts of such moduli on
4D effective theory of 5D supergravity on S^1/Z_2. We mainly discuss the
structure of the effective Kahler potential including the one-loop quantum
corrections. As an illustrative example, we construct a model in which the size
of the extra dimension is stabilized at an exponentially large value compared
to the Planck length, which is similar to the LARGE volume scenario in string
theory.
