Question: Who was the explorer that accurately mapped the coasts of the continent containing the Gelderland region and the area of Northwest Africa which WINEP bundles together under one category?

<P0-S0> The Washington Institute for Near East Policy (WINEP) is a non-profit organization for research and advice on Middle Eastern policy. <P0-S1> It regards its target countries as the Middle East but adopts the convention of calling them the Near East to be in conformance with the practices of the State Department. <P0-S2> Its views are independent. <P0-S3> The WINEP bundles the countries of Northwest Africa together under "North Africa." <P0-S4> Details can be found in Policy Focus #65. <SEP> <P1-S0> gibbs point, a rock point on the antarctic peninsula, the most northern area of the continent of antarctica, was named for african american antarctic explorer, george w. gibbs, jr. on september 2, 2009. on that date, the advisory committee on antarctic names (u.s. board on geographic names) confirmed the place name in antarctica for gibbs as the first black explorer to set foot on the continent. <P1-S1> gibbs point is a rock point forming the northwest entrance to gaul cove, on the northeast of horseshoe island, marguerite bay, antarctic peninsula. <SEP> <P2-S0> Tiësto in Concert is a DVD and Blu-ray of Tiësto's concert on May 10, 2003, at the Gelredome in Arnhem, Gelderland, Netherlands, when he performed before an audience of over 25,000 people,the concert was divided into parties with live performances of groups, bands and artists representaror to a country which, in turn representing a continent in the following order: In the presentasion Tiesto intro followed by live performance by singer Andain presented to Britain, Europe, a group of carnival Sanba presented to Brazil, South America, the singer's live performance and band Dinand Woesthoff Star Spangled Banner presented to the United States of America, North America, the Chinese group I play the theme Tiësto in Concert Asia presented to China, Asia after the live performance by singer Jan Johnston, after the live performance of Omar Ka & Fula Band presented to Africa in general, and finally the live performance of Jerry de Jonge & Beijerink Presented to Australia, Oceania. <SEP> <P3-S0> wilkes land is named after lieutenant charles wilkes (later a rear admiral), the american explorer who commanded the 1838–42 united states exploring expedition. <P3-S1> the naming is in recognition of wilkes' discovery of the continental margin over a distance of 2,400 km (1,500 miles) of coast, thus providing substantial proof that antarctica is a continent. <P3-S2> this definition of extent excludes the area east of 142°02' e, george v land, which was sighted by wilkes but has been shown by later expeditions to be further south than the positions originally assigned by him. <SEP> <P4-S0> The Piri Reis map is a world map compiled in 1513 from military intelligence by the Ottoman admiral and cartographer Piri Reis (pronounced (piɾi ɾeis)). <P4-S1> Approximately one third of the map survives; it shows the western coasts of Europe and North Africa and the coast of Brazil with reasonable accuracy. <P4-S2> Various Atlantic islands, including the Azores and Canary Islands, are depicted, as is the mythical island of Antillia and possibly Japan.