The Rebman Triangle is the name given to the area of the sea south and east of Amber that is claimed as sovereign territory by Rebma. It includes the waters over the City, but nowhere near the entire area of the nation.
Any ship crossing through the Triangle is subject to being stopped by the Rebman Navy, and formal passage must be granted. In practice, this is normally little more than a cursory acknowledgment of Rebma's claim. However, in times of strife it is not unknown for Rebma to demand formal applications for passage at its embassies, or to charge fines, or even to refuse passage altogether. Since the Triangle covers most of the approach to Amber, this has critical impacts on trade in the area. Amber's ships, however, have been granted the right of unfettered travel in perpetuity, a grace dating back to the reign of Moins.
The Triangle is marked out by three lighthouses. Two of these, Cabra and Carba, are landed and maintained by Amber. The third, Arbac, is far out to sea. More commonly known as 'Seal Island' to sailors, Arbac is a rock outcropping perhaps a quarter mile in diameter, upon which the lighthouse stands. It has earned its colloquial name as it is normally staffed by an extended family of Selkies, who are fond of sunning themselves, in seal form, on the rocks.
