The Fish River Canyon is one of the largest canyons in the world, and one of the most impressive natural features in the southern part of Namibia. The massive ravine, gouged out of the surface of the land many millions of years ago, is 550 m deep in places and about 160 km long. The Fish River Hiking Trail extends over 85 km from the main lookout point to Ai-Ais. It is self-guided and usually takes four to five days to complete. Due to extreme temperatures and the risk of flash flooding in summer, the trail is open only from 1 May to 15 September. Situated some 70 km north of Ai-Ais and 10 km from the main viewpoint along the access road to the canyon, is the Hobas Camping Site with communal ablution facilities, a kiosk with basic supplies and a swimming pool. Hobas is the official viewpoint to the Fish River Canyon.