Columbia is a small unincorporated community located within the township of Knowlton in Warren County, New Jersey. It is situated along the scenic Delaware River and is known for its picturesque landscapes and rural charm. The area features a mix of residential homes and natural spaces, making it a peaceful place to live or visit. The community is part of the larger Delaware Water Gap National Recreation Area, which offers various outdoor activities such as hiking, fishing, and camping. Columbia's proximity to major highways also provides easy access to nearby towns and cities, enhancing its appeal for residents and tourists alike.