European route E661

European route E 661 is a part of the inter-European road system. This Class B north–south route is 449 km long and it connects Lake Balaton in Hungary via western Slavonia in Croatia with Bosanska Krajina and central Bosnia.

Itinerary
The E 661 routes through three European countries:


 * Balatonkeresztúr - Nagyatád - Barcs
 * Terezino Polje - Virovitica - Grubišno Polje - Daruvar - Pakrac - Lipik - Okučani - Stara Gradiška
 * 🇧🇦Mahovljanska.jpg, Bosnia and Herzegovina]]
 * Gradiška - Banja Luka
 * Banja Luka - Jajce (Start of Concurrency of ) - Donji Vakuf
 * Donji Vakuf - Travnik - Zenica
 * Banja Luka - Jajce (Start of Concurrency of ) - Donji Vakuf
 * Donji Vakuf - Travnik - Zenica