ATITLAN or SANTIAGO DE ATITLAN, a town in the department of Solola, Guatemala, on the southern shore of Lake Atitlan. Pop. (1905) about 9,000; (1921) 7,675, almost all In dians. Cotton-spinning is the chief industry. Lake Atitlan is 24m. long and iom. broad, with 64m. circumference. It occupies a crater more than i,000ft. deep and about 4, 7oof t. above sea-level. The peaks of the Guatemala Cordillera rise round it, culminating near its southern end in the volcanoes of San Pedro (7,000ft.) and Atitlan (1 I , 7 19f t.) . Although the lake is fed by many small mountain torrents, it has no visible outlet, but probably communi cates by an underground channel with one of the rivers which drain the Cordillera. Mineral springs abound in the neighbour hood. The town of Solola (q.v.) is near the north shore of the lake.