power

water

pure

river

stone

verzaska

nature

ecotourism

background

beautiful

landscapes

canyon

carves

wears

away

closeup

large

smooth

mountain

untouched

transparent

under

rock

seaweed

green

waters

flowing

fast

switzerland

create

patterns

sharp

rough

whetstone

cut

grindstone

preparation

grind

beach

snakestone

clear

dull

environmentally

friendly

ecologically

safe

boils

bubbles