evidence: Croatia – Slovenia border is 667.8 km long. Following the breakup of Yugoslavia in 1991, Slovenia and Croatia became independent countries. As the border between the countries had not been determined in detail prior to independence, several parts of the border were disputed, both on land and at the sea. The border runs in the direction from the southwest to the northeast. Most of the border was defined by commissions, matching the northwestern border of the Kingdom of Croatia-Slavonia, and establishing a new section of Croatian border north of the Istrian peninsula according to the ethnic composition of the territory previously belonging to the Kingdom of Italy. There are however several border disputes primarily stemming from a lack of offical demarcation within Yugoslavia and differing interpretations adopted by the 2 countries. Examples include the Gulf of Piran, the Dragonja river, the peak of Sveta Gera and the Mura river.