Lake Anna in Minnesota is a 598-acre lake located in Otter Tail County, approximately four miles north of Underwood. The lake features 9 miles of shoreline and reaches a maximum depth of 55 feet, with 69% of the lake being 15 feet or less in depth. A DNR-owned concrete public access is located along the southwest shoreline.

The lake's water clarity is good, with historical Secchi disk readings ranging from 4.0 to 9.3 feet. The majority of the shoreline remains undeveloped, providing a natural setting for paddlers. Shoal water areas consist primarily of sand and gravel substrates. The entire shoreline features hardstem bulrush and common cattail vegetation, which provides important fish and wildlife habitat.

Wildlife viewing opportunities include various songbirds, waterfowl, white-tailed deer, and occasional sightings of bald eagles or ospreys. Paddlers may also encounter beaver, muskrat, and mink along the shoreline. The lake supports diverse fish populations including black crappie, bluegill, northern pike, and walleye.

The lake is classified as mesotrophic (moderately fertile) and is currently free from aquatic invasive species. Emergent aquatic plants like bulrush and cattail help maintain good water quality by protecting shorelines and absorbing pollutants.

Paddlers should be aware that these emergent plants may not be removed without a DNR permit due to their ecological value. To help prevent the spread of aquatic invasive species, all watercraft must be cleaned and drained before and after use, following Minnesota state regulations.

The combination of undeveloped shoreline, good water quality, and abundant wildlife makes Lake Anna an attractive destination for paddlers seeking a natural lake experience in central Minnesota.