Reua Thong Bah Bin is the first escort barge on the port side in the Royal Barge Procession (fig.), sailing to the left side of the Reua Thong Kwahn Fah (fig.), i.e. the first escort barge that opens the procession on starboard.

The outside hull is painted black, without any pattern, and the bow and stern are gilded, and during ceremonies adorned with two creamy tassels, one on each side, and a golden pah thip-like piece of cloth in between (fig.).