Caribou Rivers Nature Reserve is located on the estuary where the Big and Little Caribou Rivers meet and flow into Northumberland Strait. A mixed forest of red maple, aspen and black spruce borders on a 1.2 km stretch of rich river estuary. The reserve also contains part of a large shrub bog. It is home to shorebirds and nesting eagles.

The adjacent estuary is a destination for sea kayaking and other boating.