Shark Beach is the popular swimming beach within Nielsen Park, located in the Sydney suburb of Vaucluse on the shores of Port Jackson (Sydney Harbour). It is a harbour beach, protected by rocky, bushy headlands, resulting in generally gentle waves and sheltered conditions. The beach itself features soft, golden sand and is part of the Sydney Harbour National Park. The overall character is family-friendly and scenic, with expansive lawns and fig trees providing shade. The beach is protected by shark nets, which are making it one of the harbour's safest places to swim. Access for paddlers launching from shore is via the beach, with parking and facilities available within Nielsen Park. Amenities include a kiosk operating out of a former ammunition store and a waterfront restaurant. The park is a popular picnic destination with large, sheltered picnic areas. The area is suitable for exploring by kayak, with the scenic foreshore walking track running alongside the water. A recommended route is the 3.6km return Hermitage Foreshore walk, which offers views of Sydney Harbour. Water quality can be variable; a specific recommendation is to check the latest Beachwatch water quality forecast for Nielsen Park before swimming, which is a critical consideration for paddlers who may enter the water. The water is part of Sydney Harbour, and after substantial rain, nutrient runoff can affect water clarity and quality. The beach and surrounding park have historical significance, with Greycliffe House on the grounds and recorded Aboriginal archaeological sites within the park linking to the traditional lands of the Birrabirragal people.