奥法堤

奥法堤（，）是英格兰和威尔士边界上的线状军事工事，从塞文河畔的切普斯托向北延伸270公里至迪河三角洲。建于麦西亚国王奥法在位时的8世纪末，目的是防御威尔士人的进攻，因为奥法占领了很多威尔士人的土地。奥法堤在数个世纪都是英格兰和威尔士的分界线。奥法堤大部分是平坦的堤坝，个别地方高18米，在威尔士一侧有深约3.7米的深沟。有些部分至今仍然可见，成为一些徒步旅行者徒步的路线。

参考资料
外部链接
*[http://www.offasdyke.demon.co.uk/ Offa's Dyke Association website]
*[https://web.archive.org/web/20080922031918/http://www.ramblers.org.uk/INFO/paths/offasdyke.html Ramblers' Association: Offa's Dyke Path National Trail]
*[http://www.cpat.org.uk/offa/ Clwyd-Powys Archaeological Trust: Introducing Offa's Dyke]
*[http://news.bbc.co.uk/2/hi/uk_news/wales/2076470.stm How Offa's Dyke created a genetic barrier between the English and the Welsh] BBC Gene Stories article
*[http://www.offasdyke.com/ Walking Offa's Dyke Path]
*[http://www.english-heritage.org.uk/daysout/properties/offas-dyke/history-and-research/ History and research Offa's Dyke; English Heritage]