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North America:

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South America:

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Europe:

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Africa:

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Asia:

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Australia:

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Continents roughly defined by rectangles:

• North America: west of W30, north of N13
• South America: west of W30, south of N13
• Europe: between W30 and E40, north of N35
• Africa: between W30 and E40, south of E35
• Asia: east of E40, north of S4
• Australia: east of E40, south of S4

(This puts all 2008 expeditions on the right continent, may require refinement if geohashing goes mainstream.)