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How the crowd draws

249 drawings of its land border and 624 drawings of its coast, from memory on Borderline’s World map, 22 September 2026 to 27 October 2026.

Draw Guinea-Bissau

In numbers

Last updated on 27 October 2026
The real oneThe crowd’s
Area31,000 km²12,000 sq mi28,000 km²11,000 sq mi11.3% smaller
Outline1,910 km1,187 mi1,397 km868 mi26.9% shorter
Centre14.93° W, 12.06° N14.9° W, 12.1° N14.85° W, 12.02° N14.9° W, 12.0° N9 km south-east6 mi south-east
Westernmost16.73° W, 12.33° N16.7° W, 12.3° N16.37° W, 12.10° N16.4° W, 12.1° N39 km short24 mi short
Easternmost13.66° W, 12.46° N13.7° W, 12.5° N13.69° W, 12.46° N13.7° W, 12.5° N3 km short2 mi short
Southernmost15.09° W, 10.93° N15.1° W, 10.9° N15.00° W, 10.93° N15.0° W, 10.9° Nthe same
Northernmost15.19° W, 12.68° N15.2° W, 12.7° N14.78° W, 12.66° N14.8° W, 12.7° N3 km short2 mi short

Near the land border, 51% of the crowd’s lines run inside Guinea-Bissau. Near the coast, 61% 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.

Guinea-Bissau and Senegal: 332 km in the game, 341 km officially.

Guinea-Bissau’s coast: 1,277 km in the game, 350 km officially.

2 neighbours
Border withIn the gameThe crowd’s
Senegal332 km in the game341 km officially242 km the crowd’s27.1% shorter
Guinea320 km in the game421 km officially318 km the crowd’s0.6% shorter
The coast1,277 km in the game350 km officially824 km the crowd’s35.5% shorter

How it is measured

The crowd’s Guinea-Bissau: every few km along the real line, each drawing’s nearest point, inside Guinea-Bissau 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 873 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.

12 small pieces of Guinea-Bissau, 1,467 km² in all, keep their real shape, shown flat: islands no round asks players to draw, or too small to measure. They count in no figure.

Draw Guinea-Bissau yourself and add your line to the next update.