Middle Lagoon is a coastal estuary located within Mimosa Rocks National Park, north of Tathra in the Bega Valley Shire. It is a saltwater lagoon, noted for having one of the lowest levels of microplastic contamination among New South Wales estuaries. The primary access for paddlers is via Middle Beach campground, a walk-in site approximately 80 meters from the car parking area. This provides direct beach access for launching kayaks or canoes into the sea or onto the lagoon itself. The lagoon is situated in the middle of the park's coastline, and a walking track leads from the area to the lagoon. The surrounding area features a small clearing flanked by trees and bushes, with rocky coves and beaches nearby. The overall character is that of a quiet, natural spot within a national park, popular for its low levels of human impact and scenic beauty. Paddlers should be aware that Middle Beach is a popular surfing location, indicating the potential for a surf zone at the ocean entry point which must be navigated to access the open sea. The lagoon contains a vegetated island which is a habitat for shorebirds, including Oystercatchers. Given its coastal nature, paddling conditions will be heavily influenced by wind, swell, and tides.