Sachem II was a class M planet in the Alpha or Beta Quadrant, the home world of the O-Mor.

Prior to the Dominion War, Sachem II was the site of a covert Starfleet cultural observation mission. During that conflict, however, the planet was taken and occupied by Jem'Hadar troops. Following the war, in late 2376, a team from the USS da Vinci visited Sachem II to evaluate the level of cultural contamination left on the O-Mor people. A team consisting of Bart Faulwell, Vance Hawkins, and P8 Blue determined that there was no harm done, owing to the O-Mor's easy-going nature, and found no remaining Dominion technologies. (SCE eBooks: Fables of the Prime Directive, Security)

planets visited by the USS da Vinci
Magatha IVLamenda IVTenber VIIHofstrofSachem IIKalibissArtemis IXCallinon VIIDrovoer IIMariposaVemlarTellar PrimeMaeglinBetrisius IIILigon IIKharzh'ullaCoroticus IIIMerangueVrindaK'lnyGalvan VIKlorgat IVTroyius
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