Lake Tetonkaha is one of eight glacial lakes in the Oakwood Lakes chain, located in eastern South Dakota. The lake was formed over 10,000 years ago by melting glaciers that filled depressions in the earth's surface.

Access to Lake Tetonkaha is available within Oakwood Lakes State Park. An accessible fishing pier is located on the lake, and some hiking trails provide convenient shoreline access. A boat launch is situated between two camping loops, offering easy access to both Lake Tetonkaha and neighboring Johnson Lake.

The lake averages 6 to 10 feet deep, which can lead to winterkill of fish due to oxygen depletion under ice cover. Paddlers should be aware that the shallow depth may affect navigation in some areas.

Wildlife viewing opportunities abound, with many bird species frequenting the area including white pelicans, eastern bluebirds, bald eagles, and various waterfowl. The surrounding landscape features a mix of woodlands, grasslands, and wetlands.

Facilities within Oakwood Lakes State Park include campgrounds, picnic areas, beaches, and hiking trails. Canoe, kayak and paddleboard rentals are available inside the park.

Historically, the area held significance for Native American tribes. The name "Tetonkaha" means "look here great house" in the local indigenous language. Several burial mounds dating back to around the time of Christ have been found in the vicinity, likely associated with the Woodland culture.

The park offers opportunities for swimming, fishing, and wildlife observation in addition to paddling. Northern pike, bluegill, perch and walleye can be caught in Lake Tetonkaha.

Paddlers should note that the lake is subject to wind and wave action, which has caused erosion along some shorelines. This natural process is gradually making the lake more shallow over time.