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Decorative example of Senex's large scale map of North America, dedicated to Anthony Hammond, Commissioner in Her Majesty's Navy.

Senex's map is one of the earliest large-scale English maps of North America. The map represents a British attempt to consolidate new information about the region and borrows data from such recently published sources as Delisle's landmark Carte du Mexique et de la Floride and Carte de la Canada. Senex improves upon this work with a fine depiction of the Great Lakes region and the most accurate definition of the lower Mississippi River and its delta by an English cartographer of the period. Several of the most important and controversial cartographic discoveries of the period are discussed at length, including Lahontan's mythical Long River and the Salt Lake east of the Country of the Mozeemleck's, both of which are also depicted in remarkable (albeit fanciful) detail.

Sir William Phipps discovery of Spanish wrecks off the coast of the Caicos and Southern Bahamas is noted. Senex also extended the map's coverage to the Canadian Arctic and the Terra Incognita above Baffin's Bay. Present-day Oklahoma and Texas are part of La Floride, considered at the time to be a possession of the French. The Red River and the Indian villages of East Texas are portrayed accurately, but Senex, following Delisle, incorrectly placed many Texas rivers, in addition to depicting some strange and unrecognizable names.

One of the most remarkable large format English maps of the period, embellished with a large cartouche and coat of arms.

The map is known in 3 states. The first state (1710) has no imprint information in the scale of miles. The second state (1710) Includes John Senex's name in the scale of miles and deletes the names of Charles Price and John Maxwell in the title. The third state includes the imprint of T. Bowles, J. Bowles & Robert Sayer. We note also an unrecorded variant edition with a blank imprint in the scale of miles, but omitting the names of Price and Maxwell, placing it between states 1 and 2.