The Pacific Rim National Park Reserve, along with the Gwaii Haanas and Gulf Islands National Park Reserve, are the three national parks with direct access to the Pacific Ocean. Located on the west side of the Vancouver Island, the park is situated on the Estevan Lowlands, a thin strip of coastal land located between the ocean and the West Vancouver Island Fiordlands and Vancouver Island Ranges of the Insular Mountains. While the almost all of Vancouver Island is part of the Wrangellia Terrane, most of the Long Beach Unit is part of the Pacific Rim Terrane, separated from Wrangellia Terrane by the West Coast Fault.