the whole world; the seven seas
Literary or classical term for the entire world, often used in poetic or elevated contexts. The literal meaning is 'the four seas', reflecting an ancient worldview.
He is active across the whole world.
Treat everyone with the spirit of universal brotherhood.
From Chinese 四海 (sìhǎi), literally 'four seas', an ancient concept referring to the seas surrounding the known world, hence 'the whole world'.