clean transparent blue water in a mountain river. belaya river on the territory of the caucasian biosphere reserve on the

stone water quality blue spring trip cool river nature mountain stream landscape travel tourism clean mountains rock waterfall cascade clear air transparent walking national park ecology outdoor bubbling sea stony flowing pure background freshness drop splash outdoors people wave health leisure relax colorful europe purity healthy stones green caucasian kamennomostsky river belaya territory biosphere reserve guzeripl