Given the question: Information:  - Tasmania (abbreviated as Tas and known colloquially as "Tassie") is an island state of the Commonwealth of Australia. It is located to the south of the Australian mainland, separated by Bass Strait. The state encompasses the main island of Tasmania, the 26th-largest island in the world, and the surrounding 334 islands. The state has a population of around 518,500, just over forty percent of which resides in the Greater Hobart precinct, which forms the metropolitan area of the state capital and largest city, Hobart.  - The Maribyrnong River is a perennial river of the Port Phillip catchment, located in the northwestern suburbs of Melbourne, in the Australian state of Victoria.  - East Timor or Timor-Leste (Tetum: "Timór Lorosa'e"), officially the Democratic Republic of Timor-Leste, is a sovereign state in Maritime Southeast Asia. It comprises the eastern half of the island of Timor; the nearby islands of Atauro and Jaco; and Oecusse, an exclave on the northwestern side of the island surrounded by Indonesian West Timor. The country's size is about 15,410 km (5,400 sq mi).  - Papua New Guinea (PNG  Hiri Motu: "Papua Niu Gini"), officially the Independent State of Papua New Guinea, is an Oceanian country that occupies the eastern half of the island of New Guinea and its offshore islands in Melanesia, a region of the southwestern Pacific Ocean north of Australia. Its capital, located along its southeastern coast, is Port Moresby. The western half of New Guinea forms the Indonesian provinces of Papua and West Papua.  - In the study of human settlements, an urban agglomeration is an extended city or town area comprising the built-up area of a central place ("usually a municipality") and any suburbs linked by continuous urban area. INSEE, the French Statistical Institute, uses the term "unité urbaine", which means continuous urbanized area. However, because of differences in definitions of what does and does not constitute an "agglomeration", as well as variations and limitations in statistical or geographical methodology, it can be problematic to compare different agglomerations around the world. It may not be clear, for instance, whether an area should be considered to be a satellite and part of an agglomeration, or a distinct entity in itself.  - Solomon Islands is a sovereign country consisting of six major islands and over 900 smaller islands in Oceania lying to the east of Papua New Guinea and northwest of Vanuatu and covering a land area of . The country's capital, Honiara, is located on the island of Guadalcanal. The country takes its name from the Solomon Islands archipelago, which is a collection of Melanesian islands that also includes the North Solomon Islands (part of Papua New Guinea), but excludes outlying islands, such as Rennell and Bellona, and the Santa Cruz Islands.  - Melbourne is the capital and most populous city of the Australian state of Victoria, and the second-most populous city in Australia. The name "Melbourne" refers to an urban agglomeration spanning which comprises the broader metropolitan area, as well as being the common name for its city centre. The metropolis is located on the large natural bay of Port Phillip and expands into the hinterlands towards the Dandenong and Macedon mountain ranges, Mornington Peninsula and Yarra Valley. Melbourne consists of 31 municipalities. It has a population of 4,529,500 , and its inhabitants are called Melburnians.  - Mainland is a contiguous landmass that is larger and often politically, economically and/or demographically more significant than politically associated remote territories, such as exclaves or oceanic islands situated outside the continental shelf.   - Sydney is the state capital of New South Wales and the most populous city in Australia and Oceania. Located on Australia's east coast, the metropolis surrounds the world's largest natural harbour, and sprawls towards the Blue Mountains to the west. Residents of Sydney are known as "Sydneysiders". Sydney is the second official seat and second official residence of the Governor-General of Australia and the Prime Minister of Australia and many federal ministries maintain substantial presences in Sydney.  - Flemington Racecourse is a major horse racing venue located in Melbourne, Victoria, Australia. It is most notable for hosting the Melbourne Cup, which is Australia's richest horse race. The racecourse is situated on low alluvial flats, next to the Maribyrnong River. The area was first used for horse racing in March 1840.  - Vanuatu (or ; Bislama ), officially the Republic of Vanuatu (Bislama: "Ripablik blong Vanuatu"), is a Pacific island nation located in the South Pacific Ocean. The archipelago, which is of volcanic origin, is some east of northern Australia, northeast of New Caledonia, east of New Guinea, southeast of the Solomon Islands, and west of Fiji.  - Port Phillip (also commonly referred to as Port Phillip Bay or (locally) just The Bay), is a large bay in southern Victoria, Australia; it is the location of Melbourne. Geographically, the bay covers and the shore stretches roughly . Although it is extremely shallow for its size, most of the bay is navigable. The deepest portion is only , and half the region is shallower than . The volume of the water in the bay is around .  - Australia, officially the Commonwealth of Australia, is a country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands. It is the world's sixth-largest country by total area. The neighbouring countries are Papua New Guinea, Indonesia and East Timor to the north; the Solomon Islands and Vanuatu to the north-east; and New Zealand to the south-east. Australia's capital is Canberra, and its largest urban area is Sydney.  - Horse racing is an equestrian performance sport, involving two or more jockeys riding horses over a set distance for competition. It is one of the most ancient of all sports and its basic premise  to identify which of two or more horses is the fastest over a set course or distance  has remained unchanged since the earliest times.  - New Zealand is an island nation in the southwestern Pacific Ocean. The country geographically comprises two main landmassesthat of the North Island, or Te Ika-a-Mui, and the South Island, or Te Waipounamuand numerous smaller islands. New Zealand is situated some east of Australia across the Tasman Sea and roughly south of the Pacific island areas of New Caledonia, Fiji, and Tonga. Because of its remoteness, it was one of the last lands to be settled by humans. During its long period of isolation, New Zealand developed a distinct biodiversity of animal, fungal and plant life. The country's varied topography and its sharp mountain peaks, such as the Southern Alps, owe much to the tectonic uplift of land and volcanic eruptions. New Zealand's capital city is Wellington, while its most populous city is Auckland.  - Canberra (or ) is the capital city of Australia. With a population of 381,488, it is Australia's largest inland city and the eighth-largest city overall. The city is located at the northern end of the Australian Capital Territory (ACT), south-west of Sydney, and north-east of Melbourne. A resident of Canberra is known as a "Canberran".  - The Victoria Racing Club was founded in 1864. It was formed following the disbanding of the Victoria Turf Club and the Victoria Jockey Club. A legacy passed from the Victoria Turf Club was the annual "race that stops a nation", the Melbourne Cup, which was first contested in 1861.  - Indonesia (or ; Indonesian: ), officially the Republic of Indonesia, is a unitary sovereign state and transcontinental country located mainly in Southeast Asia with some territories in Oceania. Situated between the Indian and Pacific oceans, it is the world's largest island country, with more than seventeen thousand islands. At , Indonesia is the world's 14th-largest country in terms of land area and world's 7th-largest country in terms of combined sea and land area. It has an estimated population of over 260 million people and is the world's fourth most populous country, the most populous Austronesian nation, as well as the most populous Muslim-majority country. The world's most populous island of Java contains more than half of the country's population.  - The Yarra Valley is the name given to the region surrounding the Yarra River in Victoria, Australia. The river originates approximately 90 kilometres east of the Melbourne central business district and flows towards it and out into Port Phillip Bay. The name Yarra Valley is used in reference to the upper regions surrounding the Yarra River and generally does not encompass the lower regions including the city and suburban areas, where the topography flattens out, or the upper reaches which are in inaccessible bushland. Included in the Yarra Valley is the sub-region of Upper Yarra (or the Upper Yarra Valley) which encompasses the towns of the former Shire of Upper Yarra in the catchment area upstream of and including Woori Yallock. The Yarra Valley is a popular day-trip and tourist area, featuring a range of natural features and agricultural produce, as well as the Lilydale to Warburton Rail Trail.  - The Mornington Peninsula is a peninsula located south-east of Melbourne, Australia. It is surrounded by Port Phillip to the west, Western Port to the east and Bass Strait to the south, and is connected to the mainland in the north. Geographically, the peninsula begins its protrusion from the mainland in the area between Pearcedale and Frankston. The area was originally home to the "Mayone-bulluk" and "Boonwurrung-Balluk" clans and formed part of the Boonwurrung nation's territory prior to European settlement.  - The Melbourne Cup is one of Australia 's most prestigious Thoroughbred horse races . It is a 3,200 metre race for three - year - olds and over . It is the richest `` two - mile '' handicap in the world , and one of the richest turf races . Conducted annually by the Victoria Racing Club on the Flemington Racecourse in Melbourne , Victoria , the event starts at 3pm on the first Tuesday in November . The first race was held in 1861 over two miles ( 3.219 km ) but was shortened to 3,200 metres ( 1.988 mi ) in 1972 when Australia adopted the metric system . This reduced the distance by 18.688 metres ( 61.312 ft ) , and Rain Lover 's 1968 race record of 3:19.1 was accordingly adjusted to 3:17.9 . The present record holder is the 1990 winner Kingston Rule with a time of 3:16.3 .    What is the relationship between 'melbourne cup' and 'horse racing'?
The answer is:
subclass of