The map in its entirety occupies 6,080 square feet (1,850 square metres) of space. Drawing 3D Line Exercises -Snake, Ladder, Spiral - Trick Art on Paper.
The Guinness Book of Records cites the Challenger Map as the largest of its' kind in the world. 
Built by George Challenger and his family from 1947 to 1954, it features all of B.C.'s mountains, lakes, rivers and valleys in exact-scaled topographical detail.Residing in the British Columbia Pavilion at the PNE in Vancouver from 1954 to 1997 it was viewed by millions of visitors.
The Challenger Relief Map of British Columbia is a monumental, hand built 80-by-76 foot topographic map of the province. Relief maps are three dimensional maps that depict the topography of the earth’s surface. By layering contour lines one on top of another, we can create a relief map. Contour lines help show the shape of the land. A depression on a contour map is shown by contour lines with small marks pointing toward the lowest point of the depression. The higher elevations on a map are found where the contour lines make smaller closed circles. Contour lines form circles or are lines that go to the edge of the map. The slope (gradient) is steepest when the contour lines are close together and gradual when they are far apart. Remember water flows toward the lowest elevation.3. This tells you which direction the river is flowing. 
When a contour line crosses a river (stream) the contour line forms a "V". Some rules for understand topographic maps.
Closely-spaced contour lines = steep slope. When contour lines are spaced further apart, they represent a gentle slope. What is the contour interval on this map?. Contour intervals vary from one map to another depending upon the landscape presented. When drawing in contour lines one must first know the designated contour interval which is the difference in elevation between two successive contour lines. Measured in metres (in Canada) or feet (in USA). If you walk along a contour line you neither gain or lose elevation. A contour line on a map is a line that joins points of equal elevation. Even the lines you make while doodling have a term for them they are called contour lines, and they are the basis of all drawing. Contour Lines Elevation on Topographic Maps
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