Mattawa Bay facts for kids

• north side: Gouin Reservoir, Adolphe-Poisson Baie, Hanotaux Bay, Plamondon Bay;
• east side: Saraana Bay, Bureau Lake (Gouin Reservoir), Nemio River, Nemio Lake, Lepage Lake;
• south side: Flapjack River, Bignell Creek, Clova River, Tessier Lake (Gouin Reservoir);
• west side: Hanotaux Bay, Saveney Lake, Bignell Creek, Tamarac River (Gatineau River).

Mattawa Bay is separated from Saraana Bay (located to the east) by a peninsula advancing northward on 13.3 kilometres (8.3 mi). This peninsula includes the "Mont de la Tête au Brochet" (English: Mount of the Pike Head) (elevation: 453 metres (1,486 ft)) on the east bank of a strait connecting the northern part of Mattawa Bay with its southern part.

Mattawa Bay is separated from Adolphe-Poisson Bay (located to the west and northwest) by a peninsula advancing northward on 11.7 kilometres (7.3 mi) and an island (length: 5.6 kilometres (3.5 mi)). The latter island blocks the mouth of the Hanotaux Bay (south side of the mouth) and the mouth of Mattawa Bay (west side of the mouth). Another island (length: 2.2 kilometres (1.4 mi)) straddles the eastern side of the mouth of Mattawa Bay.

With a length of 17.0 kilometres (10.6 mi), Mattawa Bay has many islands. This bay is fed on the south side by the Flapjack River.

The mouth of Mattawa Bay is located at:

• 2.4 kilometres (1.5 mi) east of the mouth of Saraana Bay;
• 2.0 kilometres (1.2 mi) west of the mouth of the Hanotaux Bay;
• 33.4 kilometres (20.8 mi) south-west of the village center of Obedjiwan, Quebec which is located on a peninsula on the north shore of Gouin Reservoir;
• 90 kilometres (56 mi) south-west of Gouin Dam;
• 130 kilometres (81 mi) northwest of the village center of Wemotaci, Quebec (north shore of the Saint-Maurice River);
• 219 kilometres (136 mi) west of downtown La Tuque;
• 316 kilometres (196 mi) northwest of the mouth of the Saint-Maurice River (confluence with the St. Lawrence River at Trois-Rivières).

The mouth of Mattawa Bay converges to the northeast with a larger bay attached to Male Lake. From the mouth of Mattawa Bay, the current flows over 116.9 kilometres (72.6 mi) to Gouin Dam, according to the following segments:

• 35.0 kilometres (21.7 mi) north-east, crossing the Du Mâle Lake and the western part of Gouin Reservoir to the height of Obedjiwan, Quebec village;
• 81.9 kilometres (50.9 mi) to the East, crossing the Marmette Lake, then to the South-East crossing in particular the Brochu Lake (Gouin Reservoir) then to the East crossing the Kikendatch Bay until Gouin Dam.