The Canyon of the Tara River is 83km long and 1600m deep. It is very difficult to access, but many tourists traveling to Montenegro consider it as the best travelling experience ever.
You can explore the Canyon of the Tara River "from the bottom", which means that you can have a rafting trip. Another option is to look at it "from the top", i.e. from the Tara Bridge. This bridge was built in 1941 to connect the northern part of Montenegro with the rest of the country. At the bridge, there is a restaurant and a hotel. For the rafting trip, you can contact the agency Tara Tour in Pluzina.