The boundaries of the Colony of New Zealand are extended by the UK to include the Cook Islands.

The Colony of New Zealand was a colony of the United Kingdom from 1841 to 1907. British authority was vested in a governor. The colony had three successive capitals: Okiato in 1841; Auckland from 1841 to 1865; and Wellington from 1865. Following the New Zealand Constitution Act 1852, the colony became a Crown colony with its first elected parliament in 1853. Responsible self-government was established in 1856 with the governor being required to act on the advice of his ministers. In 1907, the colony became the Dominion of New Zealand.

The Cook Islands is an island country in Polynesia, part of Oceania, in the South Pacific Ocean. It consists of 15 islands whose total land area is approximately 236.7 square kilometres (91 sq mi). The Cook Islands Exclusive Economic Zone (EEZ) covers 1,960,027 square kilometres (756,771 sq mi) of ocean. Avarua on the main island of Rarotonga is the capital.