The Thousand Isles is a tropical archipelago , stretching over approximately 5000 leagues of ocean. It in intended as a "drop in" region to support Pirate style gameplay, that can easily be added to any fantasy campaign setting. 

The Thousand Isle's region is analogous to the late 17th century Caribbean in our world, has gunpowder firearms, tall ships and cannon, and lower overall magic then the common D&D fantasy settings. This makes the area ideal for adventures focused on seafaring and piracy. 

In the Valtentis fantasy setting, the thousand isles region west of Valoria and north of Mbo. It contains twelve large extinct volcanoes, ten large islands in an inner archipelago and hundreds of smaller ones scattered in two outer reaches

While the Thousand Isles has been populated for millenia by a polyglot of natives and neighboring nationalities, up until 500 years ago it’s society was relatively tribal, with low population densities and technology levels. That all changed with the coming of the Annwyn Empire. Unlike in neighboring Mythras, the An aggressively and extensively colonized  the Thousand Isles especially Haven and the nearby major islands. The Anwyn empire used these islands as their primary naval base (Haven Towne) in the western ocean and these islands became the furthest reach of the An empire. 

When the Annwyn Empire fell, the locals were left to their own devices. After a period of social upheaval a rich polyglot maritime culture developed scattered across the extent of the Isles. 

The island populace is still sparse by continental standard, and primarily human, though orcs and halflings are numerous in the northern reaches and giants dominate the island of GiantHome.  Elves, tieflings and dwarves are uncommon though not unknown. In general, due to their historical position as a major trade corridor, the islanders are remarkably worldly and accepting of other faiths and races,  

While the Thousand Isles are small by population and not aggressively expansionist they are consummate seafarers and far ranging traders. They have retained more of the old Annwyn naval technology then the adjacent continents have managed to do. Their ship building, metallurgy and naval warfare is well in advance of most of their neighbors, though still well behind the peak of the An Empire (mapping to roughly mid 1500’s AD in our world while most neighbors are a hundred years behind that).