This valley lies further to the southeast and parallels the other two, running from the coast inland past the small town of Seddon. It has the coolest climate due to its added proximity to the ocean on both northern and eastern sides, and can produce wines with a slightly finer acidity and mineral quality. It is also slightly drier than the other two regions. The topography is a combination of river terraces and flood plains; soils are alluvial gravels and clay and wind-blown loess. Around 30 percent of Marlborough's plantings are located here.
The central part of Marlborough is locked in between two large rivers - the Wairau and the Awatere. There, in the very heart of the Southern Valleys, lies the Waihopai Valley and Craiglochart Vineyard – the home of Midalidare New Zealand Marlborough Sauvignon Blanc.