" The greenest grass he’d ever seen—a forest of long, soft blades—ran down to the bank. The water was clear and swift as it flowed between the boulders that jutted out of the channel. Across the river, a cliff swept up for a thousand feet. Pines grew in clusters along the ledges, and the air was filled with the smell of them and the sweetness of the moving water. "

― Blake Crouch , Pines (Wayward Pines, #1)