Back (obligatory Umsu picture)

in Graub?nden, Switzerland, on top of a mountain called "Um Su" (well, almost on top).
Ahh real mountains ahead. In the Riesengebirge in Czechia all mountains look like Um Su itself. You never know where exactly the "top" is. Though, of course, Um Su is much higher, they are 1600m at most.
where is that?