Traditional beach resorts had gradually disappeared due to water pollution. Recently, however, old places have reopened in the city. The most popular places within the city are in Bakirkoy (Bakırköy), Kucukcekmece (Küçükçekmece), Sariyer (Sarıyer) and the Bosphorus. Outside the city are the Marmara Sea's Prince's Islands, Silivri and Tuzla as well as Kilyos and Sile (Şile) on the Black Sea. The Prince's Islands (Prens Adaları) are a group of islands in the Marmara sea, south of the quarters Kartal and Pendik. Pine and stone-pine wooden art nouveau-style summer mansions from the turn of the twentieth century, horse-drawn carriages (motor vehicles are not permitted) and fish restaurants make them a popular trip destination. They can be reached by ferry boats and high-speed ferries (Deniz otobüsü) from Eminönü and Kartal. Of the nine islands, four are settled. Sile (Şile) is a distant and well-known Turkish seaside resort on the Black Sea, 50 kilometers from Istanbul. Unspoiled white sand beaches can be found outside of Sile. Kilyos is a small calm seaside resort not far from the northern European entrance of the Bosphorus at the Black Sea. The place has good swimming possibilities and has became popular in the last years among the inhabitants of Istanbul as a place for excursions. Kilyos offers a beach park with (fish) restaurants and discotheques.