From the introduction:
Alvatia is a 'low magic' fantasy campaign, set in a culture not too different from 14th Century England. Players can explore the many islands of Nyranim, encountering adventures as they go – sometimes unexpectedly. As they gain influence, they may control the fate of manors, counties, or entire nations – and gain allies and enemies.
The campaign setting focuses almost exclusively on two well-developed locales: The "Village and Manor" of Ingsby, and the City of Wedburgh. Along with the HTML pages, bitmap images are also provided of area maps.