 The diocese then further extended along the left bank of the river Schelde, from the river Scarpe to the North Sea, with the exception of the Vier-Ambachten (Hulst, Axel, Bouchaute, and Assenede), which are said to have always belonged to the Diocese of Utrecht.The Schelde thus formed the natural border between the Dioceses of Tournai and Cambrai, cutting through the towns of Termonde, Ghent, Oudenarde, and Tournai itself.The North Sea seaboard between the Schelde and the Yser was wholly part of this perimeter.