Longemer Lake, Xonrupt-Longemer

The Vosges (French pronunciation: ​[voːʒ]) (German: Vogesen [foˈɡeːzn̩]) are a range of low mountains in eastern France, near its border with Germany. They extend along the west side of the Rhine valley in a north-northeast direction, mainly from Belfort to Saverne. The Grand Ballon is the highest peak at 1424 m, followed by the Storkenkopf (1366 m) and the Hohneck (1364 m).

Vosges (French pronunciation: ​[voʒ]) is a department in the east of France, named after the local mountain range. The department consists of 31 cantons and 515 communes (villages or towns) of which 242 are rural. It contains the hometown of Joan of Arc, Domrémy.

Lac de Longemer is a lake in Vosges, France. At an elevation of 736 m, its surface area is 0.76 km² (0 sq mi).

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection.

In acoustics, reflection causes echoes and is used in sonar. In geology, it is important in the study of seismic waves. Reflection is observed with surface waves in bodies of water. Reflection is observed with many types of electromagnetic wave, besides visible light. Reflection of VHF and higher frequencies is important for radio transmission and for radar. Even hard X-rays and gamma rays can be reflected at shallow angles with special "grazing" mirrors.

Xonrupt-Longemer is a commune in the Vosges department in Lorraine in northeastern France.

A lake is a body of relatively still water of considerable size, localized in a basin, that is surrounded by land apart from a river, stream, or other form of moving water that serves to feed or drain the lake. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams, which are usually flowing. However most lakes are fed and drained by rivers and streams.

Natural lakes are generally found in mountainous areas, rift zones, and areas with ongoing glaciation. Other lakes are found in endorheic basins or along the courses of mature rivers. In some parts of the world there are many lakes because of chaotic drainage patterns left over from the last Ice Age. All lakes are temporary over geologic time scales, as they will slowly fill in with sediments or spill out of the basin containing them.

Many lakes are artificial and are constructed for industrial or agricultural use, for hydro-electric power generation or domestic water supply, or for aesthetic or recreational purposes.