The most common biome in South Africa is the grassland, mostly on the Highveld. This is where grasses, low shrubs, and acacia trees, mostly camel-thorn and whitethorn are more common then plants. Plants become even more less common towards the northwest. This is because of low rainfall. There are many species of water-storing plants like aloes and euphorbias in the very hot and dry Namaqualand area. The grass and thorn savanna turns slowly into a bush savanna towards the north-east of the country, with more thick growth. There are many numbers of baobab trees in this area, near the northern end of Kruger National Park.