Tong Beak Nebula

From Memory Alpha, the free Star Trek reference

The Tong Beak Nebula is an interstellar gas cloud located on the Klingon-Cardassian border. In 2373, there were reports of Jem'Hadar activity inside the nebula. As a result, General Martok ordered the IKS Rotarran to go around the nebula on its mission to find the IKS B'Moth, adding a day to their journey. Martok cited orders from the Klingon High Council not to seek combat, although his decision was unpopular with the Rotarran crew. (DS9: "Soldiers of the Empire")