phra yai phu khok ngio chiang khan, loei province, mekong river thailand and laos pdr. viewpoint at beautiful sky walk new

asia attraction background balcony beautiful blue chiang china cliff fence glass high holiday horizontal khan khok landmark landscape laos leisure loei mekong misty mountain national natural nature ngio observation outdoor park pathway phra phu river scenery sky skywalk summer sunset thailand tianmen tourism tourist travel tropical unseen view walk water yai zhangjiajie