Answer the following question: Information:  - The Maroochy River is a river in South East Queensland, Australia. The river rises from the eastern slopes of the Blackall Range and flows east through Eumundi, before entering the sea at Cotton Tree, Maroochydore. Other populated centres in the catchment include Nambour, Eudlo, Yandina and Coolum.  - Brisbane is the capital and most populous city in the Australian state of Queensland, and the third most populous city in Australia. Brisbane's metropolitan area has a population of 2.3 million, and the South East Queensland urban conurbation, centred on Brisbane, encompasses a population of more than 3.4 million. The Brisbane central business district stands on the original European settlement and is situated inside a bend of the Brisbane River, about from its mouth at Moreton Bay. The metropolitan area extends in all directions along the floodplain of the Brisbane River Valley between Moreton Bay and the Great Dividing Range, sprawling across several of Australia's most populous local government areas (LGAs), most centrally the City of Brisbane, which is by far the most populous LGA in the nation. The demonym of Brisbane is Brisbanite.  - The Darling Downs is a farming region on the western slopes of the Great Dividing Range in southern Queensland, Australia. The Downs are to the west of South East Queensland and are one of the major regions of Queensland. The name was generally applied to an area approximating to that of the Condamine River catchment upstream of Condamine township but is now applied to a wider region comprising the Southern Downs, Western Downs, Toowoomba and Goondiwindi local authority areas. The name Darling Downs was given in 1827 by Allan Cunningham, the first European explorer to reach the area and recognises the then Governor of New South Wales, Ralph Darling.  - Queensland (abbreviated as QLD) is the second-largest and third-most-populous state in the Commonwealth of Australia. Situated in the north-east of the country, it is bordered by the Northern Territory, South Australia and New South Wales to the west, south-west and south respectively. To the east, Queensland is bordered by the Coral Sea and Pacific Ocean. Queensland has a population of 4,750,500, concentrated along the coast and particularly in the state's South East. The state is the world's sixth largest sub-national entity, with an area of 1,852,642 km. The capital and largest city in the state is Brisbane, Australia's third largest city. Often referred to as the "Sunshine State", Queensland is home to 10 of Australia's 30 largest cities and is the nation's third largest economy. Tourism in the state, fuelled largely by its warm tropical climate, is a major industry.  - South East Queensland (SEQ) is a bio-geographical, political, and administrative region of the state of Queensland in Australia, which contains 3.4 million people out of the state's population of 4.8 million. The area covered by South East Queensland varies, depending on the definition of the region. Its most common use is for political purposes, and covers and incorporates 11 local government areas, extending from Noosa in the north to the Gold Coast and New South Wales border in the south (some sources include Tweed Heads (NSW) which is contiguous as an urban area with Brisbane/Gold Coast), and west to Toowoomba (which is simultaneously considered part of the Darling Downs region).  - New South Wales (abbreviated as NSW) is a state on the east coast of :Australia. It borders Queensland to the north, Victoria to the south, and South Australia to the west. It has a coast line with the Tasman Sea on its east side. The Australian Capital Territory is an enclave within the state. New South Wales' state capital is Sydney, which is also Australia's most populous city. , the estimated population of New South Wales was 7.5 million, making it Australia's most populous state. Just under two-thirds of the state's population, 4.67 million, live in the Greater Sydney area. Inhabitants of New South Wales are referred to as "New South Welshmen".  - The Mooloolah River is a river in South East Queensland , Australia . The river rises from the eastern slopes of the Blackall Range and flows east - northeast , similar to the Maroochy River to the north . The mouth of the river is at southern Mooloolaba . The catchment area covers 221 km2 . Addlington Creek , a tributary of the Mooloolah River was dammed by the Ewen Maddock Dam in 1973 . Mountain Creek is another tributary that rises on the Buderim mountain that divides the Mooloolah and Maroochy watersheds . The gastric - brooding frog is a recently extinct frog that was discovered in only three catchments , the Mary River , Mooloolah River and Stanley Rivers . Although the Mooloolah River does n't experience major flooding often , a flood warning system was established in 2004 to inform the Sunshine Coast Regional Council with river height predictions from network of rainfall and river height field stations .    After reading the paragraphs above, we are interested in knowing the entity with which 'mooloolah river' exhibits the relationship of 'mouth of the watercourse'. Find the answer from the choices below.  Choices: - brisbane river  - condamine river  - coral sea  - sea  - tasman sea
Answer:
coral sea