The most famous tourist attraction in Flores is the 1639m Kelimutu volcano which containing three colored lakes, located in the district of Ende close to the town of Moni, although you can also visit Inierie vulcano near Bajawa town. These crater lakes are in the caldera of a volcano, and fed by a volcanic gas source, resulting in highly acidic water. The colored lakes change colors on an irregular basis, depending on the oxidation state of the lake from bright red through green and blue. There are snorkelling and diving locations along the north coast of Flores, most notably Maumere and Riung. However, due to the destructive practice of local fishermen using bombs to fish, and locals selling shells to tourists, combined with the after effects of a devastating tsunami in 1992, the reefs have slowly been destroyed. Labuan Bajo town located on the western tip is often used by tourists as a base to visit Komodo and Rinca islands. Labuan bajo also attracts scuba divers, as whale sharks inhabit the waters around Labuan bajo. The Luba and Bena villages include traditional houses in Flores, Bena is also noted for its Stone Age megaliths. Larantuka, on the isle's eastern end, is known for its Holy Week festivals. In recent years, local tourist firms around Kelimutu have begun promoting cycling tours around Flores, some of which take up to five or six days depending on the particular program.