evidence: Geography of South Korea [...] The total land area of the peninsula, including the islands, is 223,170 square kilometers. Some 44.8 percent (100 210 square kilometers) of this total, excluding the area within the DMZ, constitutes the territory of the Republic of Korea. The combined territories of North Korea and South Korea are about the same size as the United Kingdom. South Korea alone is about the size of Portugal or Hungary, or the U.S. state of Indiana.[2] [...] Approximately 30 percent of the area of South Korea consists of lowlands, with the rest consisting of uplands and mountains. The great majority of the lowland area lies along the coasts, particularly the west coast, and along the major rivers. The most important lowlands are the Han River plain around Seoul, the Pyeongtaek coastal plain southwest of Seoul, the Geum River basin, the Nakdong River basin, and the Yeongsan River and the Honam plains in the southwest. A narrow littoral plain extends along the east coast. A recent global remote sensing analysis suggested that there were 1,833 km2 of tidal flats in South Korea, making it the 17th ranking country in terms of how much tidal flat occurs there.[4]