Border Observation Post is a location, an outpost within northern Kyrat in Far Cry 4.
East of the outpost is De Pleur's compound where the first mission in Far Cry 4 takes place.
This outpost is notable for a gimmick of having tons of Royal Guard Heavy Flamers: Two are already at the base, and when reinforcements are called in, three more will arrive, totaling to five Heavy Flamers all at once. This makes alerting this outpost very dangerous as the entire area will quickly get burnt down to the ground.