Lake Gabriel is located near the administrative regions of Saguenay-Lac-Saint-Jean and Eeyou Istchee Baie-James (municipality).

Gabriel Lake has a length of 17.6 kilometres (10.9 mi), a maximum width of 5.1 kilometres (3.2 mi) and an altitude of 392 metres (1,286 ft). This lake has several bays, peninsulas and islands. The Gabriel Lake includes a peninsula attached to the South shore stretching on 3.6 kilometres (2.2 mi) towards the north meaning towards the center of the lake; the bottom of this bay receives the waters of the "Lac à l'Eau Rouge", located in the South. Another peninsula attached to the east bank advances towards the center of the lake, separating the lake in two, facing the opening of the bay stretching north-west to the mouth of the lake.

Gabriel Lake gets its supplies from:

• East by the discharge of "Lake Chopine" and the outlet of Robert Lake (Opawica River) which receives the waters of Feuquières Lake and the Ventadour River;
• South by the Queue de Castor River;
• West by the Cawcot River and the outlet of the "Eau Rouge lake".

The mouth of this Gabriel Lake is located at the bottom of a bay in the Northwest to:

• 1.9 kilometres (1.2 mi) west of Rohault Lake;
• 17.0 kilometres (10.6 mi) south-east of the mouth of Caopatina Lake;
• 64.0 kilometres (39.8 mi) South of downtown Chibougamau;
• 55.6 kilometres (34.5 mi) south-east of the village center of Chapais, Quebec;
• 171.4 kilometres (106.5 mi) west of Lake Saint-Jean;
• 57.0 kilometres (35.4 mi) north of Gouin Reservoir;
• 81.5 kilometres (50.6 mi) north of Obedjiwan Indian Reserve.[1]

The main hydrographic slopes near Gabriel Lake are:

• North side: Opawica River, Rohault Lake, Nemenjiche River, Nemenjiche Lake, La Dauversière Lake;
• East side: Robert Lake (Opawica River), Normandin River, Coquille River (Normandin River), Nicabau Lake, Rohault Lake;
• South side: Cawcot River, Ventadour River, Titipiti River;
• West side: Cawcot River, Opawica River, Surprise Lake (Roy River).

• James Bay
• Nottaway River, a watercourse
• Matagami Lake, a body of water
• Waswanipi River, a watercourse
• Opawica River, a watercourse
• Queue de Castor River, a watercourse
• Cawcot River, a watercourse
• Ventadour River, a watercourse
• Titipiti River, a watercourse
• Eeyou Istchee Baie-James (municipality), a municipality
• List of lakes in Canada