Three churches from the Dutch Reformed Church tradition in South Africa are often mentioned together as "three sister churches". They are the Dutch Reformed Church in South Africa (NGK), Dutch Reformed Church in South Africa (NHK), and Reformed Churches in South Africa (GK). The NHK developed as an autonomous reformed church in South Africa during the Great Trek in the late 1850s, because the church in the Cape Colony under British rule did not minister to them. It has congregations in South Africa, Namibia, Botswana, Zambia and Zimbabwe.