There are at least 80 named lakes and reservoirs in Lake County, Montana .
A lake is an area filled with water, localized in a basin, that is surrounded by land, apart from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, and therefore are distinct from lagoons, and are also larger and deeper than ponds, though there are no official or scientific definitions. Lakes can be contrasted with rivers or streams, which are usually flowing. Most lakes are fed and drained by rivers and streams.
A reservoir is, most commonly, an enlarged natural or artificial lake, pond or impoundment created using a dam or lock to store water.
Lake County is a county located in the northwest part of the U.S. state of Montana. As of the 2010 United States Census, the population was 28,746. Its county seat is Polson.
Flathead Lake is a large natural lake in northwest Montana, and is the largest natural freshwater lake by surface area that is west of the source of the Missouri River in the contiguous United States.
The Frog Lakes are a group of lakes, drained eastward by an unnamed stream feeding the Frog River, a tributary of the Kechika River in the Stikine Ranges of the Northern Interior of British Columbia. Though not the hydrological source of the Frog River, the lakes are notably located in an east-west aligned valley which forms the divide between the basins of the Stikine River and that of the Liard, and are therefore located on the Continental Divide between the Pacific and Arctic drainages. Draining from their west is the Pitman River, a Stikine tributary, from an unnamed lake just to their west( which also drains east to feed the Frog Lakes themselves), while the Kechika is a major tributary of the Liard, which is a tributary of the Mackenzie. The Frog Lakes Pass, as dubbed by the Canadian Mountain Encyclopedia and at an elevation of 1015 m (3330 ft), is the prominence col for 2668 m (8753 ft) Sharktooth Mountain, giving it a prominence of 1653m.
Icefloe Lake is located in Grand Teton National Park, in the U. S. state of Wyoming. Icefloe Lake is .50 miles (0.80 km) west of Middle Teton and the same distance from South Teton to the SSE. Due to a being situated at high altitude, Icefloe Lake is only free of ice in late summer.
There are at least 120 named waterfalls in Montana. A waterfall is a place where flowing water rapidly drops in elevation as it flows over a steep region or a cliff. Waterfalls are most commonly formed when a river is young.