RoboftheVolcanoWaiahuakua Sea Cave on Kauai, Hawaii, is one of the world’s longest sea caves at 350 meters. Formed by millions of years of wave erosion on volcanic rock, it’s known as the “Double Door Cave” for its two openings.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.