Grand Lake is the largest inland lake on the island of Newfoundland, stretching approximately 100 kilometers in length and up to 10 kilometers wide, with a surface area of roughly 543 square kilometers. Situated in western Newfoundland within the Humber River watershed, the lake occupies a northeast-trending, fault-controlled valley about 24 kilometers southeast of Corner Brook. Its current form was shaped by the construction of the Main Dam on Junction Brook in 1924–1925, which raised water levels by approximately 11 meters, merging the original glacial basin with Sandy Lake and Birchy Lake and engulfing several smaller interconnected ponds and rivers. The lake sits at a surface elevation that varies between 84 and 87.7 meters above sea level, reaching its highest point immediately following spring snowmelt and its lowest just before spring melt begins. With an average depth of 50 meters, Grand Lake is a deep, cold-water system with crystal-clear waters set against a backdrop of rugged forested terrain and rolling hills characteristic of Newfoundland's Appalachian fringe. The lake is fed by numerous small streams and brooks — including Sandy Lake, Hinds Brook, Red Indian Brook, and Lewaseechjeech Brook — and drains into Deer Lake via the 12-kilometer Humber Canal. The small town of Howley is the only community situated along its shoreline, lending the lake a remote, wilderness character that defines the fishing experience here.