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A fascinating map of the Northwest Coast, showing De L'Isle's conjectural northwest coast, based upon De Font and Russian Discoverers, including the Bay of the West.

The map is part of the great mid-18th Century debate, spurred by the reports of Joseph  Nicholas De L'Isle, of the Russian discoveries in the region prior to 1750, which he obtained during his time working in St. Petersburg. The debate was fed by the maps of Buache and Jefferys, which provided radically different accounts of the coast.

Ultimately, the discoveries during Cook's first voyage put an end to the debate, illustrating that the myths and legends synthesized in these maps were not at all accurate.  

Reproduced here for Denis Diderot's monumental Encyclopedie, the map is drawn from JN De L'Isle's map of September 1752, the foundational map for major debate over the mythical Sea of the West.

The map depicts the apocryphal 'Mer de l'Ouest' and the Strait of Anian, which were at the center of one of history's most heated cartographic debates about the existence of the Northwest Passage.  Prepared by the prominent, yet controversial cartographer Joseph-Nicholas de L'Isle, and published in his rare pamphlet, Nouvelles cartes des decouvertes de l'Amiral de Fonte, et autres navigateurs espagnols, portugais, anglois, hollandois, françois et russes, dans les mers septentrionales (Paris, 1753), this provocative work would become highly infuential in the depiction of the region for the next 30 years.

Meticulously compiled by De L'Isle from the work of his older brother, Guillaume De L'Isle, and information obtained by Joseph Nicholas during his time in Russia at the Royal Academy in St. Petersburg, the map synthesizes the information of Russian explorers in the first half of the 18th Century, including Spanberg, Tchirkow, Berhing and others to resurrect the myths of De Fonte and Aguilar and present the information as suggestive of both the Sea of the West and a very direct Northwest Passage reported by De Fonte immediately north of the Sea of the west and a nearly complete transit even further north via the so-called Lac Bernarda.

The map depicts the late Guillaume De L'Isle's conception of the Mer de l'Ouest, the great apocryphal sea that occupied much of western North America, which Guillaume had sketched in manuscript on several maps, but had never reduced to print, taking the form of a massive round sea, which opens to the Pacific around the place of modern day Oregon. The map further depicts the Northwest Passage, as claimed to have been discovered by the Admiral Bartholomew Fonte, an apocryphal Spanish naval officer. A letter supposedly by Fonte, dated 1640, was first published in London in the Memoirs of the Curious (1706). In this letter, Fonte claimed that he was ordered by his king to sail from Callao, Peru, northwards up the coast. Upon his journey, he claimed that he encountered a ship from Boston that had traversed the Northwest Passage, sailing through the 'Detroit d'Anian', as shown on the map. While Fonte's letter is now universally considered to have been a hoax, the story it told proved to be highly influential throughout much of the 18th-century.

Guillame de L'Isle continually experimented with new theories and discoveries in the sketches he made in preparation for his printed maps. It is known that Guillaume drew at least one manuscript map depicting the supposed Mer de l'Ouest. Critically, De L'Isle never included this information on any of his published maps. Following Guillaume's death in 1726, Joseph-Nicolas found the manuscript map in his brother's papers, and evidently decided to keep it out of the public eye for some years.

While Guillaume De L'Isle had never issued a printed map in support of his theoretical Bay of the West, his competitor, J.B. Nolin had in fact issued such a map, which was in turn copied by Pierre Mortier in Amsterdam.  The short-lived history of the first appearance of the Bay of the west at the beginning of the 18th Century supports that theory that it was likely rejected by Guillaume De L'Isle or simply omitted from printed maps for lack of adequate proof.

Joseph-Nicolas de L'Isle (1688-1768) was French geographer and the younger brother of Guillaume de L'Isle (1675-1726), mapmaker to the King of France. Joseph-Nicolas De L'Isle served as the head of the Russian Imperial Academy of Sciences in St. Petersburg from 1726-47, at which time he had access to the information then being transmitted to St. Petersburg by the Russian explorers in the North Pacific. From 1733 onwards a series of Russian expeditions under the leadership of Vitus Bering reached Alaska, making the first step towards the mapping of the Pacific Northwest of North America. Upon his return to Paris from St. Petersburg in 1747, De L'Isle began disseminating much of what he learned while in the service of the Russian Academy, a disclosure which greatly angered his former Russian employers.

Upon his return to France, one of Joseph-Nicolas de L'Isle's obsessions, which he shared with his nephew (by marriage), the cartographer Philippe Buache, was mapping the apocryphal Mer de l'Ouest and the alternative theory of the Strait of Anian.

De L'Isle and Buache first worked together on a manuscript map that was presented to the Academy Royale in 1750, and was in good part based on Guillaume De L'Isle's manuscript. This formed the basis of a map that was subsequently published by Buache, the Carte Des Nouvelles Decouvertes Au Nord de la Mer de Sud (Paris, 1752), although it featured some notable amendments.

De L'Isle was displeased by how Buache altered the details featured in their joint manuscript for the printed version, and this led to a falling out between the two cartographers. In response, the following year, De L'Isle wrote the Nouvelles cartes des decouvertes as a reprise, in good part, to properly represent his late brother's work.

De L'Isle's Nouvelles cartes des decouvertes contains 4 maps which are placed at the end of the pamphlet after the 60 pages of text. The map is historically important, as it helped to reignite a great intellectual debate about the nature of the North Pacific, and whether the Northwest Passage truly existed. The matter was of great consequence, as the discovery of Northwest Passage would revolutionize international commerce and navigation. England, France, Spain and Russia dedicated vast resources to solving the mystery, and Europe's greatest intellectuals pondered the question. Many of the leading mapmakers, such as Robert de Vaugondy and Thomas Jefferys, sought to portray the Mer de l'Ouest and its supposed connection to a transcontinental passage. Denis Diderot focused heavily on the debate in his monumental L'Encyclopedie (1751-1772), the single most influential publication of the Enlightenment era.

The Third Voyage of Captain James Cook (1776-1780) and the subsequent expeditions of George Vancouver and various Spanish navigators definitely disproved the existence of the Mer de l'Ouest, the Strait of Anian, or any other passage running through the interior of the North American continent.  

Didier Robert de Vaugondy Biography

Didier Robert de Vaugondy (ca. 1723-1786) was the son of prominent geographer Gilles Robert de Vaugondy and Didier carried on his father’s impressive work. Together, they published their best-known work, the Atlas Universel (1757). The atlas took fifteen years to create and was released in a folio and ¾ folio edition; both are rare and highly sought-after today. Together and individually, father and son were known for their exactitude and depth of research.

Like his father, Didier served as geographer to King Louis XV. He was especially recognized for his skills in globe making; for example, a pair of his globes made for the Marquise de Pompadour are today in the collection of the Municipal Museum of Chartres. Didier was also the geographer to the Duke of Lorraine. In 1773, he was appointed royal censor in charge of monitoring the information published in geography texts, navigational tracts, and travel accounts.

The Robert De Vaugondy Family

Gilles Robert de Vaugondy (1688-1766) and Didier Robert de Vaugondy (1723-1786) were influential figures in the realm of 18th-century French cartography. Originating from Paris, their contributions to mapmaking were significant during an era of expansive geographical exploration.

Gilles Robert de Vaugondy entered the world of cartography not through family tradition but through personal interest and the budding opportunities of his time. Born in 1688, he worked during a time when Paris was becoming a central hub for cartographic activities. Gilles often incorporated the latest findings from explorers into his maps, making them sought-after for their contemporary relevance. His connections weren't limited to his immediate circle; he frequently interacted with other key mapmakers, staying updated on the latest techniques and findings.

His son, Didier, was born in 1723 and had the advantage of growing up surrounded by maps and globes. While his father was renowned for maps, Didier made a name for himself in the field of globemaking. His globes were some of the most precise and detailed in France, gaining recognition even among the royalty. In addition to his work in cartography and globemaking, Didier had a keen interest in education, especially after the expulsion of the Jesuits from France. He stepped in to produce geographical educational materials, fulfilling a newfound need.

In terms of predecessors, the Vaugondys followed in the footsteps of notable French cartographers like Nicolas Sanson and Guillaume Delisle. The latter was particularly influential during the early 18th century, setting high standards in scientific cartography. As for competitors, the Vaugondys were contemporaries with Jean-Baptiste Bourguignon d'Anville, a cartographer who, like them, was rigorous in his methodologies and had a significant influence on mapmaking during the same period.

The maps and globes produced by the Vaugondys remain an enduring testament to the peak of French cartography during the Enlightenment. Their works, characterized by precision and the inclusion of contemporary findings, helped to shape our understanding of the world during a transformative period in European history.