Gebze (, ancient names:
Dakibyza and
Libyssa, Λίβυσσα in
Ancient greek) is a district in
Kocaeli Province,
Turkey. It is situated 30 miles east of
Istanbul, on the northern shore of the
Sea of Marmara. Gebze is the second largest district in Kocaeli after
İzmit, the provincial centrum in terms of population. Gebze has experienced rapid growth in recent years, from 159,116 residents in 1990 to 299,047 in 2011.