Thief River Falls is located in Pennington County Minnesota. It is one of the top birding and wildlife areas in the country with the Agassiz National Wildlife Refuge spread over 61,500 acres. For family entertainment, there is the 40,000 sq ft Indoor Water Park with over 750 feet of slides and a lazy river ride. The surrounding rivers provide canoeing, tubing and fishing. Do sample the vintage at Two Fools Vineyard and visit The Ralph Engelstad Arena and Huck Olson Memorial Civic Center, a 140,000 sq ft area for sports activities with 3,550 theatre style seats.