Lake Sevan is in eastern Armenia, a small nation in the Caucasus region between Asia and Europe. It is quite big- about 5000 sqkm, which is 1/6 of the country’s total area. Surrounded by mountains, it is one of the largest fresh water high-altitude lakes in the world. Its colours change with the seasons- from a dazzling azure to dark blue and a thousand shades in between. The water body supports a huge fish population, including the endangered ishkhan or prince trout. There are several ancient churches along the shores, the most famous being the Sevanavank monastery.