Photo from the border between Tabanovtse, Macedonia and Preshevo, Serbia.

Serbia shares boundaries with eight countries; Hungary in north, Romania and Bulgaria in east, Macedonia and Kosovo in south and with Montenegro, Bosnia and Herzegovina and Croatia in west.

Lenghts of the Serbian borders ^{(1, 2)}:
– Hungary (HURS):                              174.7 km
– Romania (RORS):                             547.9 km
– Bulgaria (BGRS):                              360.5 km
– Macedonia (MKRS):                         115.3 km
– Kosovo (KSRS):                                381.6 km
– Montenegro (MERS):                        171.5 km
– Bosnia and Herzegovina (BARS):   370.9 km
– Croatia (HRRS):                                 261.7 km
– In total:                                              2,384.1 km 

Sources

1. Statistical Yearbook 2012, Statistical Office of The Republic of Serbia, ISSN 0351-4064, Belgrade 2012; tab. 1.2, p. 18.

2. Statistical Yearbook of The Republic of Kosovo 2014, Kosovo Agency of Statistics, tab. 1-1, p. 24.