The Riga Radio and TV Tower is the third tallest tower in Europe. Its highest point reaches 368.5 m (1,209 ft), in Europe tallest are only the Ostankino Tower – 540 metres (1,772 ft) and the Kiev TV Tower – 385 metres (1,263 ft). There is an observation platform at the height of 97 m, from which most of the city can be seen (and in good weather, the Gulf of Riga, and many of the city surroundings.) The tower is built on an island called Zaíusala in the middle of the River Daugava, and the base of the tower is located about 7 m above mean sea level. The tower is said to be able to withstand extreme winds up to 44 m/s (98 mph) without any noticeable vibration.