@moemoe https://en.wikipedia.org/wiki/Horst_(geology)
apparently it's "a raised fault block bounded by normal faults."
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.