Kingdom of Swaziland, is a landlocked country in Southern Africa. It is bordered by South Africa on all sides except the northeast, where it shares a border with Mozambique. At no more than 200 km (120 mi) north to south and 130 km (81 mi) east to west, Eswatini is one of the smallest countries in Africa; despite this, its climate and topography are diverse, ranging from a cool and mountainous highveld to a hot and dry lowveld. The population is composed primarily of ethnic Swazis. The prevalent language is Swazi (siSwati in native form). The Swazis established their kingdom in the mid-18th century under the leadership of Ngwane III.