Two thousand kilometres of Pacific water separate Australia from New Zealand
The Tasman Sea is a South Pacific marginal sea between Australia and New Zealand, spanning roughly 2,000 kilometres across and 2,800 kilometres from north to south. Abel Tasman’s name stuck; Māori know it as Te Moana-a-Rehua, the sea of Rehua.
Another sourced measure gives about 2,250 kilometres of width and 2,300,000 square kilometres of area, with a maximum depth of 5,943 metres. Globigerina ooze carpets much of the floor; pteropod ooze appears south of New Caledonia, and siliceous ooze shows up south of about 30°S. Westerly depressions march east across the southern half, their northern edge near 40°S; in southern winter, from April to October, those winds push farther north. International Hydrographic Organization limits run from Gabo Island and Bass Strait islands on the west toward Three Kings and North Cape on the northeast, cutting through Cook Strait between Capes Palliser and Campbell.
Dutch explorer Abel Tasman entered European memory here in the seventeenth century; later charting filled the ditch that steamers, flying boats, and airliners would treat as the obligatory gap between two settler societies. Māori tradition sets Rehua’s sea against Te Tai-o-Whitirea at Cape Reinga, where Pacific waters meet the lover’s namesake tide. Weather systems born farther south still fling fronts across this long fetch before they hit New Zealand’s alpine spine.
For Australians and New Zealanders the Tasman is less an abstract ocean than a commuting metaphor—the ditch you cross for family, sport, and business. Nearly six kilometres of water column under busy flight paths keeps the neighbours close on the map and a long night apart at sea level. Naming rights aside, it remains the liquid hinge of Australasia, rolling between two English-speaking coasts that still measure distance in hours aloft.
Source: Tasman Sea
