Arturo,
Oman is a big place with a vast coastline. When we talk about GT fishing in Oman we're talking about 2 areas.
1. Northern Oman: this is actually geographically within the UAE and is the southern point which forms the straights of Hormuz. The area is mainly referred to as Musandam
2. Southern Oman: The Halaniyat islands (old name Kuria Muria) which are a group of islands off the southern most provence of Dhofar of which Salalah is the main city.
Regards,
Trevor