Obljaj (Serbian Cyrillic: Обљај) is a village near Bosansko Grahovo in Bosnia and Herzegovina. Obljaj is located west of Sarajevo and north of Livno near the border with Croatia. It is in the northwest corner of Bosnia and Herzegovina. It is difficult to reach except by small roads. Gavrilo Princip, whose assassination of Archduke Franz Ferdinand of Austria started World War I, was born here in 1894 and lived here when he was young. His father was a postman in the village.