'Belgian' was also the first word that sprung to mind when I set eyes on this pic. It's certainly not REINE ASTRID, because she became the jetfoil terminal at Dover!
The other two mentioned by Locking Splice went to Saudi, becoming NAJD (Roi Leopold III) and NAJD II. They were disposed of by RMT in 1978 and were scrapped 1987 and 1984 respectively. So it is one of those, I reckon!
Robert's: the reason I am sure it's not the English Channel is because I know these two ships' profiles changed slightly when they were refitted for their Red Sea service and this pic shows that changed profile.