context: The shape of Lake Pyhäjärvi is a long and arched lake divided by long peninsulas and islands into different sized backs. The length of the lake, following its curved shape, is less than 50 kilometers. The northern part of the lake is divided by the large island Luoto, with a strait less than 50 meters wide at the north end of the Sotka agglomeration. At the southern end of the island is another Strait over 50 meters wide, Kaivanto. Between Tampere and Pirkkala and cut off by highway 3, Pyhäjärvi opens a wide back 10 kilometers long and three kilometers wide. Through Tampere, the waters of Lake Näsijärvi are discharged into the lake via Tammerkoski. Next to Tammerkoski, the Vine Chickens lay down and, a little further south, the Vihioja water. The cities of Tampere and Pirkkala are bounded by Härmälänoja. All the beaches in this water basin, with a few exceptions, are built. There is a seven kilometer long and up to three kilometer wide lake section southwest of Highway 3, the southern part of which is called Saviselkä. Opposite Nokia and Pirkkalankylä lies the River Nokianvirta Luusua on the Pyhäjärvi Descending River and the Savijoki River across the lake. Myllypuro and Leppioja descend from the north to the lake via Vihnusjärvi. The Nokia River flows directly into Laajanoja from the north. The northern shores of this part of the lake are almost all built. [1] [5]
question: How Long is Lake Pyhäjärvi?
answers.text: less than 50 kilometers