useless trivia: What Word Means: A First Name - A Bog?

Questions

The highest mountain in the British Isles, Ben Nevis in western ----------, is just 4,406 feet high. In many other countries, a "mountain" of this size would be considered something less than a large hill.?

The highest mountain on Earth, -------------, reaches only about halfway through the lowest layer of the troposphere.?

There are sand dunes in Arcachon, ----------- that are 350 feet high.?

The highest point in Pennsylvania is lower than the lowest point in --------------?

There is a U.S. state capital that was named after a famous German. Bismarck, North Dakota, was named after ----------------------?