pumice rock outcrops near river. kutkhins baht, kronotsky reserve, kamchatka, russia

pumice rock outcrops river kutkhins baht kronotsky reserve kamchatka russia kuthin bata mountains stone volcanic weathered peninsula eco tourism textured landscape nature outdoor travel sandstone environment tranquility range scenic mount view beautiful adventure trekking scenery extreme activity hiking journey tracking summer formation bushes day natural material geology mineral rough porous