We decided to do the Duckhole river walk today, which is just south of Dover, the feature of this short and easy there-and-back walk is the idyllic Duckhole Lake. The 4.2km track, most of which is boardwalk, follows a stream through regrowth forest to the lake. Lying within the Southwest National Park the delightfully tranquil lake is actually a flooded sinkhole. It is part of the extensive regional cave and karst system that includes Hastings Caves. The lake is a peaceful place to sit and listen to the birds and frogs while you have a picnic. The track follows a late 19th century sawmill tramway for much of the way, and remnants of the tramway can be seen. The walk is approx. 30min to each way and based on the sign its rated in the top 60 short walks of Tasmania.