Hiking areaThousand Oaks · US
CoBa Arch
CoBa Arch is a natural rock arch perched on a ridge in the Simi Hills above Thousand Oaks, reached by a scrubby, signless hiking route through the Oakbrook open space. Visitors describe a stone span roughly 8 feet tall and 15 feet wide, with a dramatic drop-off just beyond it and wide views across the Conejo Valley, Oak Park and toward Simi Peak. This is not a stroll to a viewpoint. The arch sits at around 2,200 feet elevation at the end of a steep, sometimes overgrown climb with real scrambling, so it suits hikers who want a workout with a payoff. The reward is a secluded, almost hidden landmark plus scattered natural rock formations along the ridge—a favorite of locals who like that few signs mark the way.