  We consider maps on a surface of genus $g$ with all vertices of degree at
least three and positive real lengths assigned to the edges. In particular, we
study the family of such metric maps with fixed genus $g$ and fixed number $n$
of faces with circumferences $\alpha_1,\ldots,\alpha_n$ and a
$\beta$-irreducibility constraint, which roughly requires that all contractible
cycles have length at least $\beta$. Using recent results on the enumeration of
discrete maps with an irreducibility constraint, we compute the volume
$V_{g,n}^{(\beta)}(\alpha_1,\ldots,\alpha_n)$ of this family of maps that
arises naturally from the Lebesgue measure on the edge lengths. It is shown to
be a homogeneous polynomial in $\beta, \alpha_1,\ldots, \alpha_n$ of degree
$6g-6+2n$ and to satisfy string and dilaton equations. Surprisingly, for
$g=0,1$ and $\beta=2\pi$ the volume $V_{g,n}^{(2\pi)}$ is identical, up to
powers of two, to the Weil-Petersson volume $V_{g,n}^{\mathrm{WP}}$ of
hyperbolic surfaces of genus $g$ and $n$ geodesic boundary components of length
$L_i = \sqrt{\alpha_i^2 - 4\pi^2}$, $i=1,\ldots,n$. For genus $g\geq 2$ the
identity between the volumes fails, but we provide explicit generating
functions for both types of volumes, demonstrating that they are closely
related. Finally we discuss the possibility of bijective interpretations via
hyperbolic polyhedra.
