ocr: Foreign tourists are attracted mostly by the traditional testivals (especially the carnival in February or March), the variety ofBolivia's scenery, and: its Spanish colonial architecture. Major attractions include the Silver Mountain at Potosi, andLake liticaca, the highest navigable lake in the world, covering an - area of3,463 - sq mi. Recent political stability has encouraged some growth in tourism. The industry's potential is limited, however, by Bolivia's isolation, the rugged, - inaccessible terrain and the limited infrastructure.