The B'omar are a sentient xenophobic humanoid species which developed an isolationist faster than light space faring civilisation that established itself on several worlds of the Delta Quadrant, the quadrant of the Milky Way opposite to the one Earth it in. Their government was known as the B'omar Sovereignty. Externally, they ressemble humans with the exception of a cranial ridge that prolonge itself to the end of their nose, which much flatter and wider than that other humans, with nostrils far apart.
The B'omar were neighbors with the Nassordin, with whom they had delicate trade negotiations.
Source: Star Trek Universe, Star Trek Voyage: The Raven.