by Andreas Stephan on Flickr.Beautiful karstic rivers of Phong Nha Ke-Bang National Park in Vietnam. rayhopkins November 12, 2022 Posted in Uncategorized by Andreas Stephan on Flickr.Beautiful karstic rivers of Phong Nha Ke-Bang National Park in Vietnam.#travel, #Tourism, #beautiful, #landscape, #ASIA Author: rayhopkins