Coste Rocks Park is a BC Parks site off the south end of Coste Island in the Kitimat Arm of Douglas Channel, about 25 kilometres south of Kitimat. Access is by boat only.
The park consists of three small rocky islets and a nearby reef.
Coste Rocks is a marine park for experienced boaters, kayakers, and divers who are prepared for a tiny, facility-free offshore site. BC Parks says the rocks are the top of an underwater pillar with vertical faces to a depth of 45 metres.
Those vertical walls create vertical zonation of marine life and are known locally as an excellent underwater sea garden wall. That makes Coste Rocks a provincially significant underwater diving site and a popular scuba diving location. A tiny niche in the island provides shelter for one boat where dives can be made directly over the side.
The rocks are also a popular haul-out spot for harbour seals, often seen on the northeast rocks. Tidal-water sport fishing is noted in the park description, but hunting is not allowed. There are no trees or facilities in the park.
Plan around self-sufficient boat travel, scuba diving on the underwater pillar, experienced kayaking in the Douglas Channel area, harbour seal viewing from a respectful distance, marine photography, and chart-based route planning.
Bring drinking water because potable water is not available. Use Marine Chart 3743 for Douglas Channel and NTS Map Sheet 103 H/15 for Kitimat Arm, check marine weather and wildlife guidance, and do not expect shelter, trees, docks, or visitor facilities.
