Located in Iowa's Mahaska County, Keswick is a small town with a population of about 250 residents. The climate in Keswick is considered continental, characterized by hot summers and cold winters. Average temperatures range from the mid-20s°F (-4°C) in winter to the mid-80s°F (29°C) in summer, with moderate precipitation throughout the year.

Hydrology constituents in Keswick primarily revolve around Lake Keomah, a 366-acre (148-hectare) lake located just northeast of the town. The lake is a popular destination for fishing enthusiasts, offering a variety of fish species such as largemouth bass, bluegill, crappie, and catfish. Additionally, there are several small creeks and ponds in the surrounding area that provide opportunities for boating, kayaking, and wildlife observation.

Outdoor recreation in Keswick includes activities such as hiking, camping, and picnicking. Keomah State Park, situated along the shores of Lake Keomah, offers beautiful trails that wind through wooded areas, showcasing the area's natural beauty. The park also provides campsites, picnic areas, and playgrounds for visitors to enjoy. Overall, Keswick and its surroundings offer a peaceful retreat for nature lovers and outdoor enthusiasts.