Lake Ainsworth is a 12-hectare freshwater, tea-tree lake in Lennox Head, NSW, known for its dark, tannin-stained water from surrounding paperbark trees. It is a popular spot for family-friendly swimming, paddleboarding, kayaking, and canoeing, with amenities like paths, barbecues, and picnic tables. The lake is located at the northern end of Pacific Parade in Lennox Head, NSW. The area has undergone recent improvements and features pathways, picnic tables, barbecues, and toilets. The lake can be affected by blue-green algae, which can be harmful.