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Geographically, Helsinki is situated on the southern peninsula by the Gulf of Finland. Facing Tallinn (Estonia) across the bay, several islands, which are part of Helsinki, can be reached via boats and ferries. North of Helsinki leads to other cities in Finland and connects to the borders of Sweden and Russia.
Helsinki covers numerous islands, peninsulas and bays. The city centre is in the southern part of Finland, and the rest extends to the small islands across the sea. Some of these are the island of Suomenlinna- an inhabited sea fortress, The military island of Santahamina, as well as the islands of Seurasaari and Lauttasaari. The island of Korkeasaari is home to Finland's biggest Zoo, which can be reached via a bridge from the mainland.
Helsinki has a humid continental climate. Due to the Baltic Sea and North Atlantic Current, the temperatures are higher during the winter, with the average in January and February around −4°C (25°F).
Compared to the north of Finland, the winters in Helsinki are warmer, and the snow season is much shorter than in other parts of Finland. Winters are freezing, snowy, windy and cloudy. Helsinki experiences long daylight in summers. The summers are comfortable and partly cloudy.
The best time to visit Helsinki for warm-weather activities is from late June to mid-August. The average maximum temperature from June to August is around 19°C to 22°C (66°C to 72°F).