Offa's Dyke
- a series of earthworks marking the traditional boundary between England and Wales, running from near the mouth of the Wye to near the mouth of the Dee, originally constructed by Offa in the second half of the 8th century to mark the boundary established by his wars with the Welsh奥法大坝（形成英格兰和威尔士传统边界的一系列土筑工事, 从瓦伊河河口附近开始直到迪伊河河口附近, 最初由奥法在8世纪下半叶修建, 用以标志其与威尔士战争形成的疆界）。