Question: In which region is the country with the only Reformed church located?

full_context: Document 1: Protestantism: Protestantism spread in Europe during the 16th century. Lutheranism spread from Germany into its surrounding areas,[c] Denmark,[d] Norway,[e] Sweden,[f] Finland,[g] Prussia,[h] Latvia,[i], Estonia,[j] and Iceland,[k] as well as other smaller territories. Reformed churches were founded primarily in Germany and its adjacent regions,[l] Hungary,[m] the Netherlands,[n] Scotland,[o] Switzerland,[p] and France[q] by such reformers as John Calvin, Huldrych Zwingli, and John Knox. Arminianism[r] gained supporters in the Netherlands and parts of Germany. In 1534, King Henry VIII put an end to all papal jurisdiction in England[s] after the Pope failed to annul his marriage to Catherine of Aragon; this opened the door to reformational ideas, notably during the following reign of Edward VI, through Thomas Cranmer, Richard Hooker, Matthew Parker and other theologians. There were also reformational efforts throughout continental Europe known as the Radical Reformation—a response to perceived corruption in both the Roman Catholic Church and the expanding Magisterial Reformation led by Luther and various other reformers—which gave rise to Anabaptist, Moravian, and other Pietistic movements. In later centuries, Protestants developed their own culture, which made major contributions in education, the humanities and sciences, the political and social order, the economy and the arts, and other fields.
Document 2: Mary, mother of Jesus: The multiple churches that form the Anglican Communion and the Continuing Anglican movement have different views on Marian doctrines and venerative practices given that there is no single church with universal authority within the Communion and that the mother church (the Church of England) understands itself to be both "catholic" and "Reformed". Thus unlike the Protestant churches at large, the Anglican Communion (which includes the Episcopal Church in the United States) includes segments which still retain some veneration of Mary.
Document 3: Protestantism: Today, Lutheranism is one of the largest branches of Protestantism. With approximately 80 million adherents, it constitutes the third most common Protestant confession after historically Pentecostal denominations and Anglicanism. The Lutheran World Federation, the largest global communion of Lutheran churches represents over 72 million people. Additionally, there are also many smaller bodies such as the International Lutheran Council and the Confessional Evangelical Lutheran Conference, as well as independent churches.
Document 4: Tuvalu: Football in Tuvalu is played at club and national team level. The Tuvalu national football team trains at the Tuvalu Sports Ground in Funafuti and competes in the Pacific Games. The Tuvalu National Football Association is an associate member of the Oceania Football Confederation (OFC) and is seeking membership in FIFA. The Tuvalu national futsal team participates in the Oceanian Futsal Championship.
Document 5: Protestantism: Anglicanism comprises the Church of England and churches which are historically tied to it or hold similar beliefs, worship practices and church structures. The word Anglican originates in ecclesia anglicana, a medieval Latin phrase dating to at least 1246 that means the English Church. There is no single "Anglican Church" with universal juridical authority, since each national or regional church has full autonomy. As the name suggests, the communion is an association of churches in full communion with the Archbishop of Canterbury. The great majority of Anglicans are members of churches which are part of the international Anglican Communion, which has 80 million adherents.
Document 6: Paris: Almost all Protestant denominations are represented in Paris, with 74 evangelical churches from various denominations, including 21 parishes of the United Protestant Church of France and two parishes of the Church of Jesus Christ of the Latter-Day Saints. There are several important churches for the English-speaking community: the American Church in Paris, founded in 1814, was the first American church outside the United States; the current church was finished in 1931. The Saint George's Anglican Church in the 16th arrondissement is the principal Anglican church in the city.
Document 7: Tuvalu: A traditional sport played in Tuvalu is kilikiti, which is similar to cricket. A popular sport specific to Tuvalu is Ano, which is played with two round balls of 12 cm (5 in) diameter. Ano is a localised version of volleyball, in which the two hard balls made from pandanus leaves are volleyed at great speed with the team members trying to stop the Ano hitting the ground. Traditional sports in the late 19th century were foot racing, lance throwing, quarterstaff fencing and wrestling, although the Christian missionaries disapproved of these activities.
Document 8: Protestantism: Several countries have established their national churches, linking the ecclesiastical structure with the state. Jurisdictions where a Protestant denomination has been established as a state religion include several Nordic countries; Denmark (including Greenland), the Faroe Islands (its church being independent since 2007), Iceland and Norway have established Evangelical Lutheran churches. Tuvalu has the only established church in Reformed tradition in the world, while Tonga—in the Methodist tradition. The Church of England is the officially established religious institution in England, and also the Mother Church of the worldwide Anglican Communion.
Document 9: Tuvalu: A major sporting event is the "Independence Day Sports Festival" held annually on 1 October. The most important sports event within the country is arguably the Tuvalu Games, which are held yearly since 2008. Tuvalu first participated in the Pacific Games in 1978 and in the Commonwealth Games in 1998, when a weightlifter attended the games held at Kuala Lumpur, Malaysia. Two table tennis players attended the 2002 Commonwealth Games in Manchester, England; Tuvalu entered competitors in shooting, table tennis and weightlifting at the 2006 Commonwealth Games in Melbourne, Australia; three athletes participated in the 2010 Commonwealth Games in Delhi, India, entering the discus, shot put and weightlifting events; and a team of 3 weightlifters and 2 table tennis players attended the 2014 Commonwealth Games in Glasgow. Tuvaluan athletes have also participated in the men's and women's 100 metre sprints at the World Championships in Athletics from 2009.
Document 10: Tuvalu: The popular sports in Tuvalu include kilikiti, Ano, football, futsal, volleyball, handball, basketball and rugby union. Tuvalu has sports organisations for athletics, badminton, tennis, table tennis, volleyball, football, basketball, rugby union, weightlifting and powerlifting. At the 2013 Pacific Mini Games, Tuau Lapua Lapua won Tuvalu's first gold medal in an international competition in the weightlifting 62 kilogram male snatch. (He also won bronze in the clean and jerk, and obtained the silver medal overall for the combined event.) In 2015 Telupe Iosefa received the first gold medal won by Tuvalu at the Pacific Games in the powerlifting 120 kg male division.
Document 11: Tuvalu: Tuvaluans are well known for their seafaring skills, with the Tuvalu Maritime Training Institute on Amatuku motu (island), Funafuti, providing training to approximately 120 marine cadets each year so that they have the skills necessary for employment as seafarers on merchant shipping. The Tuvalu Overseas Seamen's Union (TOSU) is the only registered trade union in Tuvalu. It represents workers on foreign ships. The Asian Development Bank (ADB) estimates that 800 Tuvaluan men are trained, certified and active as seafarers. The ADB estimates that, at any one time, about 15% of the adult male population works abroad as seafarers. Job opportunities also exist as observers on tuna boats where the role is to monitor compliance with the boat's tuna fishing licence.
Document 12: Protestantism: The Church of England declared its independence from the Catholic Church at the time of the Elizabethan Religious Settlement. Many of the new Anglican formularies of the mid-16th century corresponded closely to those of contemporary Reformed tradition. These reforms were understood by one of those most responsible for them, the then Archbishop of Canterbury Thomas Cranmer, as navigating a middle way between two of the emerging Protestant traditions, namely Lutheranism and Calvinism. By the end of the century, the retention in Anglicanism of many traditional liturgical forms and of the episcopate was already seen as unacceptable by those promoting the most developed Protestant principles.
Document 13: Tuvalu: Tuvalu participates in the work of Secretariat of the Pacific Community, or SPC (sometimes Pacific Community) and is a member of the Pacific Islands Forum, the Commonwealth of Nations and the United Nations. Tuvalu has maintained a mission at the United Nations in New York City since 2000. Tuvalu is a member of the World Bank and the Asian Development Bank. On 18 February 2016 Tuvalu signed the Pacific Islands Development Forum Charter and formally joined the Pacific Islands Development Forum (PIDF).
Document 14: Protestantism in Tuvalu: Protestants in Tuvalu- Tuvalu is one of the most heavily Protestant nations in the world. The Congregational Christian Church of Tuvalu, (Tuvaluan: Te Ekalesia Kelisiano Tuvalu, EKT), is the de facto state church of Tuvalu, the only established church in the Reformed tradition in the world. Its adherents comprise about 97% of the 12,000 inhabitants of the archipelago, and theologicly it is part of the Reformed tradition.
Document 15: Tuvalu Rugby Union: The Tuvalu Rugby Union, or TRU, is the governing body for rugby union in Tuvalu. It was established in 2007 and is a full member of the Federation of Oceania Rugby Unions (FORU), which is the regional governing body for rugby in Oceania.
ground_truth: Oceania
sub_queries: Who has the only Reformed church? Answer: Tuvalu
The continent of Tuvalu is what? Answer: Oceania