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16-747: Oppenau is situated in the Rench valley in the Black Forest . The nearest major cities are Offenburg and Freudenstadt . In the 12th century an agricultural settling made up the village Noppenouwe, which succumbed to the House of Zähringen until 1218. After they have been died out, the dominance in the Rench-valley was fragmented. The in 1192 in Lierbach founded All Saints’ Abbey took a high political, cultural and religious influence to Oppenau at this time. In 1316 bishops from

32-692: Is an eastern tributary of the Rhine in the Ortenau in Central Baden , Germany . It rises on the southern edge of the Northern Black Forest at Kniebis near Bad Griesbach im Schwarzwald . The source farthest from the mouth is that of the Schöngrundbächle which rises at a height of around 915 m above NN in the parish of Zuflucht . After flowing through its steep mountainside klinge it

48-737: Is joined by other streams to form, first, the Old ( Alter ), then the Wild Rench ( Wilder Rench ), which first becomes the Rench below Bad Griesbach. The Rench runs in a prominent southerly arc through the Central Black Forest and crosses the hilly region of Ortenau with its orchards and vineyards before breaking out into the Rhine Plain. After just under 57 km it, together with the Mühlbach , confluences with

64-800: The Acher-Rench Correction between 1936 and 1967. Even in the Black Forest foothill zone above Oberachern , the Acherner Mühlbach was cut short by the Acher at a weir, which has an average discharge here of around 5 m³/s. The Acher itself—also called the Feldbach in Oberachern — then crosses the borough of Achern and is finally led to the Rhine and Rench with some of its water (high water discharge) into

80-658: The Foothill Zone with the town of Oberkirch at the foot of the vineyards and the little town of Renchen . The B 28 federal road, long an important route through the Black Forest, runs through the Rench valley linking the Strasbourg area with the upper Neckar region. It climbs steeply above Bad Griesbach in hairpin bends to the Alexanderschanze (968 m). The Rench Valley Railway starts at Appenweier and runs as far as Bad Griesbach . It has also contributed to

96-551: The Iffezheim Lock into the Rhine, around 10 kilometres below its old confluence. From Greffern the Acher is used as a link for the different areas of the Söllingen/Greffern Polder . In order to protect the Acher even when the polder floods, a pumping station near Greffern was brought into operation in 2005. Under the name Oberes Achertal a protected area was created by the county council of Ortenaukreis around

112-670: The Oos to the north. The source region of the Acher lies on the northeastern mountainside of the Vogelskopf ( 1,055.8 m above  sea level (NN) ), an area divided into cirques formed by the ice age . The spring named the Acherquelle rises at a height of 848 m above  sea level (NN) in the area of the Ruhesteinloch , which is named after the Ruhestein Saddle to

128-743: The Rhine Plain Canal used to pass under it coming from the west, being joined by the water-rich Sulzbach , the lower reaches of the Sasbach and Laufbach as well as the Acherner Mühlbach. The Rhine Plain Canal then used to empty into the Acher itself from the east. Further north the Sandbach finally joins the Altrheinzug ("Old Course of the Rhine") as the lower reaches of the Acher are called. It empties below

144-685: The waterfalls at the Edelfrauengrab above Ottenhöfen , joins it. From the point where the Unterwasser valley joins from the south, the Acher continues in a northwesterly direction, flowing through the municipality of Kappelrodeck , to the Upper Rhine Plain , which it reaches in Achern , the largest town of the northern Ortenaukreis . In the Rhine Plain, the course of the river has been made more complex by numerous hydro-engineering measures, especially

160-641: The Acher Flood Control Channel. Just before the flood channel and the Acher divide, the Fautenbach joins it. The originally, partially canalised river runs northwards as the Acher (Feldbach) to Greffern . Before the construction of the Rhine Side Canal ( Rheinseitenkanal ) it emptied into the Rhine here. However, the Acher has since been channelled into the Rhine Dyke ( Rheindeich ). A section of

176-725: The French Strasbourg started reign about the Rench-valley. After the Reichsdeputationshauptschluss in 1803, Oppenau became part of Baden . In 1990, German politician Wolfgang Schäuble suffered an assassination attempt in Oppenau. Oppenau's main attractions are the ruins of the All Saints' Abbey , which was destroyed by fire in 1804, and the All Saints Waterfalls close to them. Rench The Rench

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192-775: The Hornisgrinde and the Vogelskopf. In this section the Acher is also called the Seebach , a clue that the tributary stream from the Mummelsee was originally the main headstream of the Acher, despite its somewhat lower discharge. Below the Vorderseebach the Seebach merges with the Grimmerswaldbach from the north. Here the Acher valley heads south for about a kilometre roughly to where the rugged Gottschläg valley, with its Karlsruher Grat and

208-462: The Rench at Erlach , picks up the Acher Canal at Rheinau and merges with the actual Rench at Memprechtshofen . Acher The Acher is a 53.6-kilometre-long river and tributary of the Rhine in the county of Ortenau , in the south German state of Baden-Württemberg . It flows in a northwesterly direction from the Black Forest to the Rhine, between the two rivers Rench to the south and

224-473: The Rhine at 314.7 km between Helmlingen ( Rheinau ) and Lichtenau . The upper Rench valley around Bad Peterstal-Griesbach initially cuts into the forested bunter sandstone plateau before entering a more open, very steep rugged valley, near the town of Oppenau . There it is joined from the east by the Lierbach , well known for the All Saints Waterfalls . In Lautenbach the valley abruptly broadens into

240-538: The development of the thermal baths in the Rench valley, which had already been established in the 16th century in Bad Griesbach, but which soon extended to Bad Antogast near Oppenau (especially for the nobility), Bad Peterstal and Bad Freiersbach (today part of Bad Peterstal-Griesbach). The "Rench Flood Canal" was built between 1936 and 1953 at the Acher Rench Correction to divert floodwaters. It branches off

256-508: The east and is located between the Vogelskopf and Seekopf ( 1,054.2 m above NN ). The Acher initially flows northwards, descending steeply. At its confluence with the Seebach, which joins from the north from the Mummelsee below the Hornisgrinde , it turns westwards and flows through the trough-like valley of Seebach . Here the valley reaches a depth of about 550 metres between

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