Arches are formations that look like half a circle above an opening or hole in a rock.

VOA: special.2009.04.15

One huge rock is called Half Dome.

VOA: special.2009.01.07

Half soccer pub, half punk rock bar, Churchill's is 100% one of the most interesting spots in the city, an establishment that straddles lines of income, race and nationality - in a lot of ways, a microcosm for Miami itself.

BBC: Multicultural Miami

It was tied to a tree and was rubbing against a half-submerged rock.

NEWYORKER: Max at Sea

Music is only half of what rock legends KISS are about.

FORBES: KISS's Gene Simmons Teaming Up With Angry Birds