in Ancient Geography, a river of Belgica, rising in Mount Vogelus on the borders of the Lingoines, and which, after receiving a part of the Rhine called Valahis, forms the island of the Batavi, and passes off into the sea, at the distance of 80 miles. Now called the Maas, or Meuse; rising in Champagne, on the borders of the county of Burgundy, or Franche Comté, at a village called Meuse, whence the appellation; and running north through Lorraine and Champagne into the Netherlands: it afterwards directs its course north-east and then west; and joining the Waal, runs to Dort, and falls into the German sea, a little below the Briel.

MOSÆ POX, in Ancient Geography, supposed to be Maastricht, situated on the Maas. E. Long. 5° 40'. N. Lat. 50° 55'.