West Bay Campsite's Buller zone sits within Nelson Lakes National Park, tucked amongst kanuka and manuka forest on the southwestern shore of Lake Rotoiti, near where the lake drains into the Buller River.

The site is reached via Mt Robert Road, roughly 3 km by road or a 30-minute walk from St Arnaud village, just off SH63. The campsite has no powered sites and is open seasonally, from late November through to late April.

A boat launching ramp is nearby, and the adjacent Buller River is a popular fishing spot. The Buller zone is one of two camping areas at West Bay, with the Jetty zone located nearby to the east.