Herzegovina
Herzegovina ( or ; Serbo-Croatian: "Hercegovina", Херцеговина, ) is the southern region of Bosnia and Herzegovina. While there is no official border distinguishing it from the Bosnian geographical region, it is sometimes asserted that the borders of the region are Dalmatia to the southwest, Montenegro to the east, Mount Maglić to the northeast, and Mount Ivan to the north. Measurements of the area range from , or around 22% of the total area of the present-day country, to , around 24% of the country.
European route E73
The E73 route through Croatia starts at Duboševica border crossing, following the D7 state road to Beli Manastir and Osijek. In Beli Manastir, there is a junction with the European route E662, also signposted as the D212. The D7 road carries the E73 through Osijek, to the southern city bypass signposted as the D2 state road providing a connection to the A5 motorway to the west of Osijek. The A5 is scheduled for extension north to the Hungarian border, where it would link up with the Hungarian M6 motorway. The A5 extends south to the Sredanci interchange of the A3 motorway, which carries the E73 concurrently with the E70 east to the Velika Kopanica interchange, where the E73 leaves the motorway and rejoins the D7 road once again for a leg to the border of Bosnia and Herzegovina and Slavonski Šamac/Šamac border crossing at the Sava River. Similarly to the northward extension, a southward extension of the A5 is planned spanning the Sredanci interchange and a new border crossing at Svilaj. First segment of the E73 through Croatia, between Hungary and Bosnia and Herzegovina, is long, including of motorways.
The E73 route in Bosnia and Herzegovina is carried by the M17 road through a number of cities, as it spans the country from its northern border with Croatia to its southern border with Croatia. Some sections of the M17 road are concurrent with other national roads, such as M5 and M18, including a section north of Sarajevo signposted as the M5, and the A1 motorway between Visoko and Sarajevo. The E73 in Bosnia and Herzegovina consists mostly of two-lane roads with at-grade intersections, running through Doboj, Zenica, Sarajevo, Konjic and Mostar. In Zenica, the E73 forms a junction to the European routes E661 and E761. The latter and the E73 are concurrent between Zenica and Sarajevo, where the E761 diverges towards Višegrad. The European route E762 also forms a junction with the E73 in Sarajevo, heading towards Nikšić, Montenegro. The route crosses back into Croatia south of Čapljina. Total length of the E73 route through Bosnia and Herzegovina is long.