Croats of Bosnia and Herzegovina Dalmatian Croatia formed a united Croatian kingdom, which included Dalmatia and part of Bosnia and Herzegovina, Pannonia (eastern Slavonia and northeastern Bosnia), and Savia (western Slavonia). In 1102 Croatia entered into a union with the Kingdom of Hungary. After this, Bosnia, which was earlier part of the Kingdom of Croatia, started to disassociate with Croatia. At first, Bosnia became a separate principality under Ban Kulin who managed to solidify Bosnian autonomy at the expense of more powerful neighbours, but only in the 14th century did Bosnia become a formidable state. In the 14th century, King Tvrtko I conquered part of
Transport in Bosnia and Herzegovina routes to Croatia, Germany, Austria, France, Netherlands, Montenegro, Belgium, Denmark, Sweden and Serbia. Despite Bosnia & Herzegovina's geographical closeness to Serbia, there is only one bus a day, which takes more than 8 hours due to the lack of proper roads. Sava River (northern border) open to shipping but use limited (2008) Gradiška, Brod, Šamac, and Brčko (all inland waterway ports on the Sava none of which are fully operational), Orašje, Bosnia none (1999 est.) Air transport begin in Bosnia and Herzegovina during the period of the Kingdom of Yugoslavia when the flag-carrier Aeroput inaugurated a regular flight linking the