Mount Elgon is Kenyas second highest mountain. It lies 140 km north-east of Lake Victoria and is bisected by the Kenya-Uganda border. An ancient eroded volcano with a huge caldera, its summit has the spectacular flat-topped basalt column known as Koitobos. Another unique feature of the mountain is the lava tube caves, some over 60 meters wide and only caves in the world frequented by elephants (and other animals) digging for salts. Mount Elgon National Park was gazetted in 1968 and covers a narrow transect on its north-eastern slopes. The remaining forest and moorland is part of the Mount Elgon Forest Reserve.