Centro Region, Portugal known as the Princes of Beira. Along the region’s mountainous border with Spain are a series of fortresses and castles that once protected the country from its many invaders. Over the centuries, Moors, Christians, Spaniards and Portuguese have all tried to take these villages, but their higher elevations usually gave them a distinct advantage. On that border, the more than one dozen fortified frontier villages beckon today’s visitors to come explore a 900-year history — full of the heroism, epic battles and romance upon which Portugal struggled to become a nation. Today, Portugal boasts the longest-standing border in all of
Japan–Russia border into the Soviet Union in 1945. Russia treats the islands as an integral part of the country. There are no border crossing points on the Russian-Japanese border, as it is a purely maritime boundary. During the existence of the land border in Sakhalin (1905-1945), it was crossed by one road. Soviet–Japanese border conflicts Japan–Russia border The Japan–Russia border is the "de facto" maritime boundary that separates the territorial waters of the two countries. According to the Russia border agency, the border's length is 194.3 km. The two countries do not share a terrestrial border, although in 1905-1945 the Russian Empire,