  We consider a one-dimensional totally asymmetric exclusion process on a ring
with extended inhomogeneities, consisting of several segments with different
hopping rates. Depending upon the underlying inhomogeneity configurations and
for moderate densities, our model displays both localised (LDW) and delocalised
(DDW) domain walls and delocalisation transitions of LDWs in the steady states.
Our results allow us to construct the possible steady state density profiles
for an arbitrary number of segments with unequal hopping rates. We explore the
scaling properties of the fluctuations of LDWs and DDWs.
