East Herzegovina (Serbo-Croatian: Istočna Hercegovina, Источна Херцеговина) is the eastern part of the historical Herzegovina region in Bosnia and Herzegovina, east of the Neretva river, part of the Republika Srpska entity. Major towns are Trebinje, Nevesinje and Bileća, predominantly inhabited by ethnic Serbs (see Serbs of Bosnia and Herzegovina). West Herzegovina is the western part, west of the Neretva river, and is today administratively part of the Herzegovina-Neretva Canton and West Herzegovina Canton, predominantly inhabited by ethnic Croats, located in the Federation of B&H entity. The easternmost parts of historical Herzegovina (the Duchy of St. Sava and Sanjak of Herzegovina) lie in Montenegro, in so-called "Old Herzegovina", which became part of the Principality of Montenegro in 1878. In 1991, local ethnic Serbs of the region declared the territory of SAO East Herzegovina independent and joined other Serb territories into Republika Srpska by 1992. The meso-region has since been named Trebinje Region (Regija Trebinje/Регија Требиње).

Ottoman period

In the first Ottoman defters groups of Christian shepherds appear, declaring themselves as Vlachs who have settled in the empty parts of eastern Herzegovina. In that area, 1624 there were still 14 Catholic parish churches.

Municipalities

Settlement	Population (2013)
Berkovići	2,727
Bileća	11,536
Gacko	9,734
Istočni Mostar	280
Ljubinje	3,756
Nevesinje	13,758
Trebinje	31,433

Culture

The "Association of Municipalities of Herzegovina"

Events

• Miss East Herzegovina