About 4.8 km (3.0 mi) north of Chelan, the Greenwater Creek meets up with the Red Deer River.

The Red Deer River is a significant river in east central Saskatchewan and west central Manitoba as it is a major tributary of Lake Winnipegosis The closest town, Porcupine Plain,[4] is about 37 kilometres (23 mi) away from the lake's main public access.

All but a small portion of the western shore is within the park's boundary, which is where Marean Lake Resort is located.

Over 200 species of birds can be found around the lake, including Trumpeter swans, bald eagles, common yellowthroats, yellow-bellied sapsuckers, osprey, and the red-breasted merganser.

The resort now features beach access, public showers, a boat launch, restaurant, convenience store, camping with 75 full-service sites, and cabin rentals.