The Chalm is the port district of Tear.
The area contains many warehouses for goods shipped to Tear. There area also many inns and taverns catering to the sailors and workmen that frequent the area. The taverns are noted for cheap wine, bad ale, occasional fights and unending dice games.
Mat visits the area to get away from the Stone and Moiraine as well as to gamble a bit after the Lordlings stop playing cards with him.