The Mewesian asteroid belt was an interstellar asteroid field close by to Starbase 37. While not dense enough to pose a navigational hazard for a fully-shielded starship, it did pose a danger for shuttlecraft and other smaller vessels. However, Lieutenant Arex was able to successfully navigate the field en route to the starbase, due to his unique Triexian abilities. (NF - No Limits short story: "The Road to Edos")