The Colony of Natal was a British colony in south-eastern Africa. It was proclaimed a British colony on 4 May 1843 after the British government had annexed the Boer Republic of Natalia, and on 31 May 1910 combined with three other colonies to form the Union of South Africa, as one of its provinces. It is now the KwaZulu-Natal province of South Africa. It was originally only about half the size of the present province, with the north-eastern boundaries being formed by the Tugela and Buffalo rivers beyond which lay the independent Kingdom of Zululand (kwaZulu in the Zulu language).