Lake Vermilion-Soudan Underground Mine State Park is located in the state of Minnesota, not Arkansas. The park features the historic Soudan Underground Mine, which was once one of the richest iron ore mines in the world. Visitors can take a guided tour of the mine and learn about the mining history of the area. Other points of interest include hiking trails, fishing on Lake Vermilion, and camping facilities.

Some interesting facts about the park include the fact that the Soudan Underground Mine goes down to a depth of 2,341 feet, and that it was in operation from 1882 to 1962. The park also contains the largest lake in the state park system, Lake Vermilion, which covers over 39,000 acres.

The best time of year to visit the Lake Vermilion-Soudan Underground Mine State Park is during the summer months, when the weather is warm and the park is fully operational. However, visitors can also enjoy winter activities such as snowmobiling and cross-country skiing.

In summary, Lake Vermilion-Soudan Underground Mine State Park is a must-visit destination for history buffs and outdoor enthusiasts in Minnesota. The historic Soudan Underground Mine is a fascinating attraction, and the park offers a range of outdoor activities and facilities.