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How the crowd draws

564 drawings of its land border and 775 drawings of its coast, from memory on Borderline’s World map, 16 September 2026 to 27 October 2026.

Draw Senegal

In numbers

Last updated on 27 October 2026
The real oneThe crowd’s
Area197,000 km²76,000 sq mi181,000 km²70,000 sq mi8.1% smaller
Outline3,662 km2,276 mi2,880 km1,789 mi21.4% shorter
Centre14.47° W, 14.37° N14.5° W, 14.4° N14.43° W, 14.41° N14.4° W, 14.4° N6 km north-east4 mi north-east
Westernmost17.54° W, 14.76° N17.5° W, 14.8° N16.81° W, 14.72° N16.8° W, 14.7° N79 km short49 mi short
Easternmost11.38° W, 12.48° N11.4° W, 12.5° N11.47° W, 12.79° N11.5° W, 12.8° N10 km short6 mi short
Southernmost12.36° W, 12.31° N12.4° W, 12.3° N16.71° W, 12.37° N16.7° W, 12.4° N7 km short4 mi short
Northernmost14.97° W, 16.69° N15.0° W, 16.7° N15.08° W, 16.63° N15.1° W, 16.6° N6 km short4 mi short

Near the land border, 56% of the crowd’s lines run inside Senegal. Near the coast, 76% run inland.

Borders and coast

Why two lengths?

A line’s length depends on how closely it is drawn. The game’s lines are simplified: they keep a point every few kilometres and cut across small bends. The official lengths, from the CIA World Factbook, are measured on other lines. A border measured on a finer line, following every bend of its rivers and ridges, comes out longer.

Coasts differ most, and either way. Some official coastlines follow every inlet and island (Canada’s 202,080 km); others are smoothed on purpose, crossing bays and sounds (the United States’ 19,924 km), and can come out shorter than the game’s.

Players draw against the game’s line and are scored against it, so the crowd’s length is compared with the game’s, both measured the same way. Set against an official length measured another way, the comparison would say more about the two methods than about the crowd.

Senegal and Gambia: 686 km in the game, 749 km officially.

Senegal’s coast: 1,254 km in the game, 531 km officially.

5 neighbours
Border withIn the gameThe crowd’s
Gambia686 km in the game749 km officially665 km the crowd’s3.1% shorter
Mauritania626 km in the game742 km officially613 km the crowd’s2.1% shorter
Mali340 km in the game489 km officially307 km the crowd’s9.7% shorter
Guinea-Bissau330 km in the game341 km officially324 km the crowd’s1.8% shorter
Guinea278 km in the game363 km officially245 km the crowd’s11.9% shorter
The coast1,254 km in the game531 km officially545 km the crowd’s56.5% shorter

How it is measured

The crowd’s Senegal: every few km along the real line, each drawing’s nearest point, inside Senegal or outside it; the median over a short stretch is where the crowd puts the line there, and the real outline moved by it is the crowd’s. Where the move folds a narrow inlet over itself, the loop is cut.

The 1,339 drawings that scored 10 or more on Borderline’s World map, scribbles left out, the real line the game’s own. Area true to scale; the outline copies the real line’s detail, so its length changes only where the shape moves or a loop is cut. The map lays the 1,000 most recent; the heat map, the crowd’s shape and every figure use all 1,339.

Draw Senegal yourself and add your line to the next update.