Five kilometers east of the city proper lays the graveyard of the Balangay 1 dated 320 A.D. or 1688 years old. This wooden plank-build and edge-pegged boats measured an average of 15 meters in length and 3 meters wide across the beam. To date, 9 Balangays have already been discovered in Ambangan, Libertad sites. Three have been excavated and others are still in Situ.