Ключевые слова: america, background, blue, bright, briones, california, clouds, contra costa, contrast, countryside, county, deep, diablo, forest, grass, green, hiking, hills, land, landscape, light, meadow, mount, mountain, nature, nobody, oak, outdoors, panoramic, park, pasture, protected, recreation, regional, rolling, rural, rustic, scenery, sky, spring, sunny, trail, trees, united states, valley, verdant, walking, winter, woods,