The tribunal, tasked with determining the 670km land border and the sea border by the two countries in 2009, drew the Piran Bay border from the mouth of the Dragonja river to 45° 30' 41,7'', a point at the top of the bay that gives Slovenia around 75% of the bay.

Tribunal president Gilbert Guilaume explained at the Peace Palace in The Hague that the tribunal had taken into account that Slovenian police had been much more active in the bay before both countries became independent in 1991.

When drawing the border beyond this point, the arbitrators took into account the boxing in configuration of Croatia's coast, deciding for an "equidistance" line that is moved slightly to the south.

As to Slovenia's "junction" with the high seas, a task set to the tribunal as Croatia agreed to arbitration in the face of Slovenia's blockade of its EU accession talks, the tribunal set a 2.5 nautical miles-wide junction area that is defined as a kind of mixture of Croatian and international waters but with all rights that apply to international waters.

On the land border, the tribunal mostly followed cadastral limits, thus also concluding that three settlements on the left bank of the Dragonja remained in Croatia.

On the other hand, the disputed 70 hectares forest area on the east slope of Mount Snežnik ended on the Slovenian side, as did the village of Drage in Bela Krajina.

The Slovenia-controlled military facility on Trdinov vrh, 1,178-metre hill in the Gorjanci hills, was awarded to Croatia, while it seems that the hill's telecommunications tower will remain Slovenian.

Cadastral lines were also followed in Posavje and Obrežje as well as in the Sotla river area, where the border does not run alongside the river.

A notable exception to the cadastral rule was made in the Mura river area for the settlement Brezovec-part or Murišće, which was declared Slovenian.