 
 <prompt> Wetin be di main idea of di passage? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```Dey get at least 3,223 named lakes and reservoirs for Montana, wey include Flathead Lake, wey be di biggest natural freshwater lake for di western United States. Oda major lakes include Whitefish Lake for di Flathead Valley and Lake McDonald and St. Mary Lake for Glacier National Park. Di biggest reservoir for di state na Fort Peck Reservoir for di Missouri river, wey dey contained by di second biggest earthen dam and biggest hydraulically filled dam for di world. Oda major reservoirs include Hungry Horse for di Flathead River; Lake Koocanusa for di Kootenai River; Lake Elwell for di Marias River; Clark Canyon for di Beaverhead River; Yellowtail for di Bighorn River, Canyon Ferry, Hauser, Holter, Rainbow; and Black Eagle for di Missouri River.``` 