Question: What is the name of this region of New South Wales, Austrialia, whose coalfield was discovered by Edgeworth David?

Context articles: Mungindi
New South Wales wine
List of New South Wales state elections
Edgeworth David Medal
Hunter Region
Edgeworth David
Laurence Street
South Maitland coalfields
Edgeworth FC
Ross Street

Mungindi is a town and locality on the border of New South Wales (NSW) and Queensland, Australia.
 The town is within Moree Plains Shire in New South Wales and within the Shire of Balonne in Queensland.
 Within Queensland, the locality is split between the Shire of Balonne (the western part) and the Goondiwindi Region (eastern part).
 It possesses a New South Wales postcode.
 Mungindi sits on the Carnarvon Highway and straddles the Barwon River which is the border between New South Wales and Queensland.
 At the 2011 census , Mungindi had a population of 738 on the New South Wales side.
 The population on the Queensland side is now included in Thallon, which had a population, including the surrounding area, of 382.
New South Wales wine is Australian wine produced in New South Wales, Australia.
 New South Wales is Australia's most populous state and its wine consumption far outpaces the region's wine production.
 The Hunter Valley, located 130 km north of Sydney, is the most well-known wine region but the majority of the state's production takes place in the Big Rivers zone-Perricoota, Riverina and along the Darling and Murray Rivers.
 The wines produced from the Big Rivers zone are largely used in box wine and mass-produced wine brands such as Yellow Tail.
 A large variety of grapes are grown in New South Wales, including Cabernet Sauvignon, Chardonnay, Shiraz and Sémillon.
This article provides a summary of results for elections to the New South Wales Legislative Assembly, the lower house in New South Wales's bicameral state legislative body, the Parliament of New South Wales, which came into being in 1856 when New South Wales achieved responsible government.
 New South Wales politics were initially non-partisan, with individual Members of Parliament choosing to align either with the Government or the Opposition.
 This changed at the 1887 election where, for the first time, candidates were members of official political parties.
 The first two major parties to form were the Free Trade Party and the Protectionist Party.
 The 1887 election saw the 79 members of the Free Trade Party elected form the government with the 37 elected Protectionist Party members form the opposition.
 The next election saw the Free Trade Party retain government but with a reduced majority.
 The 1891 saw the Australian Labor Party for the first time.
 These three parties then fought out the next two elections through to 1898.
 After Federation in 1901, the Free Trade Party changed their name to the Liberal Reform Party with the Protectionists becoming the Progressive Party.
The Edgeworth David Medal is awarded annually by the Royal Society of New South Wales for distinguished contributions by a young scientist under the age of 35 years for work done predominantly in Australia or which contributed to the advancement of Australian science.
The Hunter Region, also commonly known as the Hunter Valley, is a region of New South Wales, Australia, extending from approximately 120 km to 310 km north of Sydney.
 It contains the Hunter River and its tributaries with highland areas to the north and south.
 The Hunter Valley is one of the largest river valleys on the NSW coast, and is most commonly known for its wineries and coal industry.
Sir Tannatt William Edgeworth David (28 January 1858 – 28 August 1934), professionally known as Edgeworth David, was a Welsh Australian geologist and Antarctic explorer.
 A household name in his lifetime, David's most significant achievements were discovering the major Hunter Valley coalfield in New South Wales and leading the first expedition to reach the South Magnetic Pole.
 He also served with distinction in World War I.
Commander Sir Laurence Whistler Street, AC, KCMG, KStJ, QC (born 3 July 1926) is an Australian jurist; formerly the 2nd youngest Chief Justice of the Supreme Court of New South Wales and Lieutenant Governor of New South Wales.
 He is the third consecutive generation of the Street family to have served New South Wales in these offices.
 Street's appointment to the offices of Chief Justice of the Supreme Court of New South Wales and Lieutenant Governor of New South Wales made the Street family the only family in Australian judicial appointments with three consecutive vice-regal appointments to their name.
The South Maitland coalfields was the most extensive coalfield in New South Wales until the great coal mining slump of the 1960s.
 It was discovered by Lieutenant-Colonel Paterson's party when they were engaged in an exploratory visit to the Hunter River Valley during July 1801.
Edgeworth Football Club is an Australian semi-professional football club based in the suburb of Edgeworth, near Newcastle, New South Wales.
 The club currently competes in the National Premier Leagues Northern NSW.
Emeritus Professor Ross Howard Street FAA (29 September 1945, Sydney –) is an Australian mathematician specialising in category theory.
 He is an emeritus professor of mathematics at Macquarie University, a fellow of the Australian Mathematical Society (1995), and was elected Fellow of the Australian Academy of Science in 1989.
 He was awarded the Edgeworth David Medal of the Royal Society of New South Wales in 1977, and the Australian Mathematical Society's George Szekeres Medal in 2012.