If you select one of our standard undermount basins from the product listing, these will be oval shaped (in fact, they are a perfect ellipse for those who are keyed up on their shapes!)
 
However, we have had more and more requests for rectangular basins and have decided to offer these as a bespoke option on our single basin vanity units w700mm and larger and our double basin vanity units w1400mm and larger (we regret they are too large to fit inside our smaller units). 
 
The dimensions of the basin are as follows:
 
 w465mm x d310mm.