Matilija Falls is located deep in the wilderness at the end of a difficult 9 - mile ( 14 km ) roundtrip hike .
Matilija Falls is a multi-tiered waterfall known for its swimming holes .
Matilija Falls , a multi-tiered waterfall known for its swimming holes , is located deep in the wilderness at the end of a difficult 9 - mile ( 14 km ) roundtrip hike .