Lake Ilsanjo is a picturesque body of water located in Sonoma County, California. Nestled within Annadel State Park, it offers visitors a serene environment surrounded by lush forests and scenic trails. The lake is a popular spot for hiking, picnicking, and wildlife observation. The lake is approximately 10 acres in size and is fed by natural springs. It is home to various species of fish, making it a favored location for fishing enthusiasts. Additionally, the area around Lake Ilsanjo features diverse flora and fauna, contributing to its natural beauty and ecological significance.