Geography
The Bos originates at the Zallenberg at an elevation of 490 metres (1,610 ft) above sea level. From here, the stream flows predominantly to the east. It passes the village of Bosen, part of Nohfelden, on the north and then, after about 3.4 kilometres (2.1 mi), it reaches the Bostalsee. Just before the reservoir it is joined by the right tributary Pärwiesbach which reaches it after flowing through Bosen. Its mouth is located about 300 metres (980 ft) south of the village of Eckelhausen, also part of Nohfelden. The outlet of the Bostalsee is located southwest of Gonnesweiler. South of the Bostalsee the Dämelbach flows into the Bos. After only about a further 1 kilometre (3,300 ft) the Bos joins the Nahe on the left at an elevation of 379 metres (1,243 ft) above sea level.
On its 5.8-kilometre-long (3.6 mi) course, the Bos drops 111 metres (364 ft), which corresponds to a mean bottom slope of 1.91%. It drains a 12,634 square kilometres (4,878 sq mi) drainage basin.
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Nohfelden is a municipality in the district of Sankt Wendel, in Saarland, Germany. It is situated approximately 15 kilometres (9.3 mi) north of Sankt Wendel, and 20 kilometres (12 mi) southwest of Idar-Oberstein. It was formed during administrative reform in January, 1974 from the merger of 13 previously independent municipalities.
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The Azevka is a river the Agryzsky District of the Republic of Tatarstan, Russia. It is a left tributary of the Izh in the basin of the Kama.
The Bostalsee is a reservoir in the municipality of Nohfelden in the northern Saarland. It was created in 1979. The dam has a length of 500 metres. The lake is almost exclusively used for recreation. The hydropower from the stored water has been used since the end of 2013 to a small extent to generate electricity, especially to light the circular walk around the lake in winter. The southwestern part of the lake has been designated as a nature reserve.
