To the west of the Kwando River and the east of the Caprivi Game Park is a narrow triangle of land. It is wide in the north, but becomes narrower towards the Botswana border. It is known as 'the triangle', 'the Susuwe Triangle' or 'the Golden Triangle', and though outside any current park, it is rich in game.
To explore this you'll need a 4WD, and some detailed maps. Before you start, turn north from the western end of the Kongola Bridge, following the sign to 'Information at Susuwe'. About 3km along this road is the NWR rangers' station. You must check in here and obtain permission before entering the area, and it's also wise to ask their advice on what you plan to do. There's also a bush airstrip here.
One of the most popular spots is Nambwe Campsite, 14km south of the main road, on the western bank of the Kwando. (The turn-off is opposite the turning north to Susuwe.) Just follow the track from near the bridge that runs south, parallel to the river. It has no facilities, but plenty of game.
Well worth visiting is Horseshoe Lagoon, about 5km south of Nambwe, which is a stunning ox-bow lake with excellent game. Note that there is no camping allowed here.