European route E 661 is a part of the inter-European road system. This Class B north–south route is 449 kilometres (279 mi) long and it connects Lake Balaton in Hungary via western Slavonia in Croatia with Bosanska Krajina and central Bosnia.

The E 661 routes through three European countries:

•  Hungary
  • 68: Balatonkeresztúr ( E71) - Nagyatád - Barcs
•  Croatia
  • D5: Terezino Polje - Virovitica - Grubišno Polje - Daruvar - Pakrac - Lipik - Okučani ( E70) - Stara Gradiška
•  Bosnia and Herzegovina
  • E661: Gradiška - Banja Luka
  • M-16: Banja Luka - Jajce (Start of Concurrency of E761) - Donji Vakuf
  • M-5: Donji Vakuf - Travnik - Zenica ( E73)

• UN Economic Commission for Europe: Overall Map of E-road Network (2007)

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