In a press release on 19 June 2009, Island Oil CEO Paul Griffith’s stated that they had massive exploration areas in Morocco. 

“Island now holds exploration permits covering a gross area of 48,331 sq. kms. demonstrating that Morocco forms a key component in our future business development strategy”, Griffith stated

But if you add up Island Oil and Gas’ known exploration permits in Morocco and occupied Western Sahara, you don’t get 48,331 square kilometres, as Island stated, but somewhere between 47,941 or 47,806. 

These are the known blocks of Island Oil and Gas:

Zag basin 21807 sq.km. (or 21.672,5) 
Tarfaya 1 2000 sq.km. 
Tarfaya 2 1966 sq.km. 
Tarfaya 3 1989 sq.km. 
Tarfaya 4 1994 sq.km. 
Tarfaya 5 2000 sq.km. 
Tarfaya 6 1995 sq.km. 
Tarfaya 7 1490 sq.km. 
Foum Draa/ 
Sidi Moussa 12700 sq.km. 
TOTAL: 47,941 sq.km. (or 47,806.)

Thus, somewhere between 390 and 524 square kilometres are missing in the equation. 

There are, logically, 3 possible solutions to the missing (or "extra", depending on how you see it) acreage. 

1) Island Oil and Gas has a block in Morocco or Western Sahara which is not accounted for so far 2) the source material (published by ONHYM and the companies themselves) is wrong; 3) the CEO of Island Oil and Gas fails in mathematics. 

As WSRW has stated before, Island Oil and Gas has already failed in geography.