Mutara Nebula

The Mutara Nebula was a nebula located in the Mutara sector.

In 2228, the Federation and Klingons engaged in a battle near the nebula resulting in the destruction of the USS Bastion and at least five Klingon cruisers. 

In 2285, the USS Enterprise (NCC-1701) engaged the USS Reliant (NCC-1864) in a fierce battle in the nebula, which resulted in the destruction of the Reliant.