In the course of negotiations, the factors to be taken into account were to include: the general configuration of the coasts of the Parties, as well as the presence of any special or unusual features; so far as known or readily ascertainable, the physical and geological structure and natural resources of the continental shelf areas involved, the element of a reasonable degree of proportionality between the extent of the continental shelf areas appertaining to each State and the length of its coast measured in the general direction of the coastline, taking into account the effects, actual or prospective, of any other continental shelf delimitations in the same region.