This region is situated in the centre of Portugal and has good natural conditions for the development of various agricultural activities. The Tejo (Tagus) Designation of Origin (Figure No. 14) has six sub-regions (Almeirim, Cartaxo, Chamusca, Coruche, Santarém and Tomar). As in other wine regions of Portugal, this also has a long history in wine production, with particular reference to the thirteenth century, during which most of its production was exported.
The Serras (mountains) of Aires and Candeeiros are those that most influence the climate of the region, seen as a temperate South Mediterranean. The Tagus River is the main river that crosses the region, promoting a rainfall ranging between five hundred and six hundred millimetres.
This region is divided into three distinct zones named O Campo, O Bairro and Charneca, but with a single Designation of Origin. The area of O Campo has extensive plains along the bedside of the River Tagus, for which is subject to periodic flooding that contribute to high natural soil fertility. The area of O Bairro is located between the Tagus Valley and the massifs of Porto de Mós, Candeeiros and Montejunto, presenting clay-limestone soils with light terrain reliefs. Charneca is located on the southern part of the Tagus region and presents mostly sandy and medium fertile soils.
The most used white grapes varieties are Fernão Pires, Arinto, Rabo de Ovelha, Bical and Trincadeira da Prata, and regarding the red grape varieties, Castelao Trincadeira, Caladoc, Alicante Bouschet, Syrah and Merlot.This region has a range of qualities that enables it to produce good wines at a very competitive price. The expression of several grape varieties in association or with varietal character is also very present and reveals a commitment to innovation.